The flow of time

Oracle bone 年 shows a person (人) carrying ripe grain stalks (禾) on their back — the harvest. The encoded definition: "one year" = "one cycle of grain ripening". For ancient agricultural China, the calendar was the harvest. The character has stylized over millennia until the human-with-grain image is barely visible, but the etymology is essential for understanding why "year" and "harvest" share so many compound roots in CJK languages. Identical across 繁體 / 新字体 / 简体.

Mandarin: nián, rising 2nd tone. 年 covers calendar year, age, and harvest equally: 今年 (jīnnián, this year), 去年 (qùnián, last year — note: 去 here means "past", not "go"), 明年 (míngnián, next year), 年龄 (niánlíng, age), 年纪 (niánjì, age — colloquial), 年级 (niánjí, grade in school), 新年 (xīnnián, New Year). 过年 (guònián) literally "to pass the year" = to celebrate Chinese New Year, which still anchors on the spring agricultural calendar despite urban modernization.

Japanese: on-reading ネン (nen) — 来年 (rainen, next year), 去年 (kyonen, last year), 学年 (gakunen, school year), 年齢 (nenrei, age), 年金 (nenkin, pension), 一年 (ichinen, one year). Kun-reading とし (toshi) for emotional/personal age — お年 (o-toshi, "your honored age"), 年寄り (toshiyori, elderly person), 年取る (toshi toru, to grow old). The split between ネン (formal/calendar) and とし (personal/lived) is characteristic of Japanese.

The Japanese New Year お正月 (oshōgatsu) is one of the most important annual events, and the greeting 明けましておめでとうございます ("Happy New Year") uses the verbal sense of "year-opening". 年賀状 (nengajō, New Year postcards) are sent by the millions every December.

Memory aid: a person carrying grain — the harvest defines the year.

Phonetic-semantic compound (形聲字): 日 (sun) + 寺 (temple / office, providing the sound). Before clocks, the sun's position WAS the time — and 寺 in this character is purely phonetic, lending its sound to the new compound. The encoded definition is "what we read off the sun's position".

Three forms: 繁體 時 / 新字体 時 / 简体 时 (the right side simplifies to 寸).

Mandarin: shí, rising 2nd tone. 时间 (shíjiān, time — abstract concept), 小时 (xiǎoshí, hour — "small time"), 时候 (shíhou, moment / time when), 有时 (yǒushí, sometimes), 当时 (dāngshí, at that time), 同时 (tóngshí, at the same time), 时差 (shíchā, jet lag — "time difference"). The Mandarin word for "hour" being literally "small time" is one of the cleanest semantic transparencies in the language.

Japanese: on-reading ジ (ji) for clock-time and compound counting — 時間 (jikan, time / hours), 三時 (sanji, three o'clock), 時刻 (jikoku, exact time), 当時 (tōji, at that time). Kun-reading とき (toki) is the everyday word for "occasion / when" — その時 (sono toki, at that moment), 時々 (tokidoki, sometimes — note the doubling marker 々 means repeat the previous character). The compound 時計 reads とけい (tokei, watch / clock) — both characters are pronounced via kun-reading in this irregular but extremely common compound.

The Mandarin 时候 (shíhou) and Japanese 時 (toki) both function as relativizers — "the time when ~" — and are central to the grammar of complex sentences. Mastering them is a first-year priority.

Memory aid: sun + temple-bell. The sun tells the time; the temple rings the hour.

Compound character: 立 (variant of 辛, a sharp tool / pin) + 木 (tree) + 斤 (axe). The encoded scene: an axe just chopping a fresh tree. The ancient definition of "new": that which has just been cut, still bearing the scent and light of the fresh wood. Identical across 繁體 / 新字体 / 简体. Pairs with 古 (old, previous entry) as one of the fundamental temporal oppositions.

The etymology beautifully grounds an abstract adjective in a concrete sensory experience — the smell of just-cut wood. Modern speakers don't feel this anymore, but the character preserves it.

Mandarin: xīn, level 1st tone. 新 covers freshness, recency, and the new in opposition to the old: 新年 (xīnnián, New Year), 新闻 (xīnwén, news), 新鲜 (xīnxiān, fresh), 重新 (chóngxīn, again / anew), 创新 (chuàngxīn, innovate), 新郎 (xīnláng, groom — "new bridegroom"), 新娘 (xīnniáng, bride). 重新 and 创新 carry strong "starting over / making fresh" weight in modern usage.

Japanese: on-reading シン (shin) for compounds — 新聞 (shinbun, newspaper — Japan's oldest dailies date to the 1870s), 新年 (shin'nen, new year), 最新 (saishin, latest / newest), 革新 (kakushin, reform / innovation), 新幹線 (shinkansen, "new trunk line" = bullet train), 新宿 (Shinjuku, Tokyo's major district — "new lodging"). Kun-reading あたら.しい (atara.shii, new) is one of the highest-frequency Japanese adjectives. Fresh things use 新, modern food often pairs with 新鮮 (shinsen, fresh).

The word 新幹線 (Shinkansen) — Japan's legendary high-speed rail since 1964 — uses 新 to declare itself "the new line" — and the name has stuck for over half a century.

Memory aid: an axe just struck a tree — the scent of fresh-cut wood = newness.

The etymology of 今 is debated — most likely it pictured a closed-mouth profile or a stoppered jar, both expressing "the moment of stopping / containment". From there, the meaning shifted to "now / this present moment" — time held still. Identical across 繁體 / 新字体 / 简体. Pairs with 古 (old / past, earlier batch) — 古今 (old + now) is the classical CJK term for "across all times".

Mandarin: jīn, level 1st tone. 今 is the everyday word for "now / this": 今天 (jīntiān, today), 今年 (jīnnián, this year), 今晚 (jīnwǎn, tonight), 今后 (jīnhòu, hereafter), 至今 (zhìjīn, until now), 古今 (gǔjīn, past and present). The temporal frame "今X" appears constantly: 今早 (this morning), 今下午 (this afternoon).

Japanese: TWO on-readings + irregular kun. コン (kon) is dominant in compounds — 今度 (kondo, this time / next time), 今週 (konshū, this week), 今月 (kongetsu, this month), 今晩 (konban, tonight), 今夜 (kon'ya, tonight). キン (kin) is rarer. The kun-reading いま (ima) is the everyday word for "now" — 今 (ima, now), 今すぐ (ima sugu, right now), 今に (ima ni, soon).

Critical irregular reading: 今日 (today) reads きょう (kyō), NOT こんにち (konnichi) in everyday speech. This is one of the foundational Japanese irregular readings every learner masters: 今日 → kyō. Compare 今週 (konshū) and 今朝 (kesa, this morning — another irregular). However, the formal greeting こんにちは (Konnichi wa, "hello") DOES come from 今日, with the older reading. 今日 has both readings depending on context — kyō for "today", konnichi for "the present day / nowadays" in formal contexts.

Memory aid: a stopper / closed lid — the present moment held still in time.

回 is a picture of water swirling in a whirlpool — the inner 口 and outer 囗 are two nested coils. From spinning round and returning to the start grew the senses "to turn, to return, a time (occurrence)."

Mandarin: huí, 2nd tone. 回家 (huí jiā, to go home), 回来 (huílái, to come back), 回答 (huídá, to answer), 一回 (yī huí, once). China's Muslim minority is called 回族 (Huízú, the Hui people). A common character, ranked 172nd.

Japanese: on-readings カイ (kai) and エ (e), kun まわ.る (mawaru) and まわ.す (mawasu). 回る (mawaru, to turn), 一回 (ikkai, once), 回転 (kaiten, rotation), 回答 (kaitō, a reply). Conveyor-belt sushi is 回転寿司 (kaitenzushi, "rotating sushi").

Korean hanja-sound "hoe": 回轉 (hoejeon, rotation), 回復 (hoebok, recovery), 回答 (hoedap, a reply), 一回 (ilhoe, once), 撤回 (cheolhoe, withdrawal). Counting occurrences uses 一回 (ilhoe), 二回 (ihoe).

Memory aid: a whirlpool coiling round in two nested rings — turning back to where it began.

期 is a phonetic-semantic compound: 其 (qí, "this / that" — providing the sound) + 月 (moon / month). The composite meaning derives from the moon component: "one full cycle of the moon's waxing and waning" = a period, a span of time. The character grew from astronomical observation into the abstract sense of "appointed time / expected period / phase." Time as measured by lunar cycles became time as measured by social agreements.

Korean reading "gi." 期間 (gigan, period — universal time-span vocabulary), 時期 (sigi, period / time / juncture), 期限 (gihan, deadline / time limit — used constantly: "submission deadline"), 學期 (hakgi, semester — Korean academic year divides into 1 hakgi spring and 2 hakgi fall), 初期 (chogi, early period), 末期 (malgi, end period — used in medical contexts: "terminal patient"), 延期 (yeongi, postponement). Korean academic and project vocabulary leans heavily on gi.

Mandarin qī, 1st tone. 期 (qī), 期间 (qījiān, period), 时期 (shíqī, time period), 学期 (xuéqī, semester), 延期 (yánqī, to postpone). And distinctively, Mandarin uses 星期 (xīngqī, "star-period" = week / weekday): 星期一 Monday, 星期二 Tuesday, etc. The Mandarin word for "week" preserves an astronomical etymology — naming the seven days after planetary cycles, just as Western languages (Saturday = Saturn's day) do. Compare to the alternative 周 (zhōu), also meaning "week" but with different etymology.

Japanese on-readings split. キ (ki) is the standard: 期間 (kikan, period), 時期 (jiki, time), 学期 (gakki, semester), 初期 (shoki, early period), 延期 (enki, postponement). Alternative on-reading ゴ (go) appears in the literary 最期 (saigo, "final period" = one's last moments / death — the moment of dying). Critical homophone caution: 最期 (saigo, final moment / death) and 最後 (saigo, final / last) sound identical but have distinct meanings — 最後 is "last in sequence," 最期 specifically means "death-time / final hours." Japanese funerary and historical writing distinguishes the two carefully.

Memory aid: 其 (sound) + 月 (moon-month) — one cycle of the moon = a period.

度 combines 广 (a building) with a hand (又) inside it; from measuring length by hand came "to measure, a ruler, a standard, an extent." It began from the old practice of gauging length by handspans.

Korean hanja-sound "do" (also "tak"): 制度 (jedo, system), 溫度 (ondo, temperature), 角度 (gakdo, angle), 程度 (jeongdo, degree / extent), 態度 (taedo, attitude), 法度 (beopdo, law). When it means "to reckon" it is read "tak" — 忖度 (chontak, to surmise).

Mandarin: dù, 4th tone (degree) / duó, 2nd tone (to estimate). 温度 (wēndù, temperature), 角度 (jiǎodù, angle), 程度 (chéngdù, degree), 态度 (tàidù, attitude), 速度 (sùdù, speed) / 揣度 (chuǎiduó, to surmise). A one-character, two-sound case — "degree" is dù (4th), "to estimate" is duó (2nd).

Japanese: on-readings ド (do), ト (to), タク (taku), kun たび (tabi). 温度 (ondo, temperature), 角度 (kakudo, angle), 態度 (taido, attitude), 一度 (ichido, once), 支度 (shitaku, preparation — a タク reading), 度々 (tabitabi, often). In Japanese "~times" is counted 一度, 二度.

Memory aid: a hand (又) measuring length inside a building (广) — from measuring come law and degree.

Phonetic-semantic compound: 糸 (silk thread) + 冬 (winter — providing both phonetic value and semantic suggestion). The original oracle bone form showed a piece of thread with knots tied at both ends — the literal "end of a thread". Adding 冬 reinforced the meaning: winter is the ending season. So 終 covers thread-end, season-end, and any "ending" by extension. Three forms: 繁體 終 / 新字体 終 / 简体 终. Pairs with 始 (start, previous entry) — 始終 (shǐzhōng / shijū / sijong) is the classical CJK term for "from start to finish".

Mandarin: zhōng, level 1st tone (simplified 终). 终 in modern Chinese — note the spoken Mandarin verb for "to end" is more often 结束 (jiéshù) than 终, but compounds: 终点 (zhōngdiǎn, terminus / endpoint), 终于 (zhōngyú, finally / at last — extremely high frequency), 最终 (zuìzhōng, ultimately), 始终 (shǐzhōng, throughout / always), 终生 (zhōngshēng, lifelong). 终于 is one of the most useful intermediate-level Mandarin adverbs.

Japanese: on-reading シュウ (shū) for compounds — 終了 (shūryō, conclusion / end), 最終 (saishū, final / last), 終電 (shūden, last train of the day — the inverse of 始発), 終点 (shūten, terminal station), 終日 (shūjitsu, all day long). Kun-reading お.わる (o.waru, to end — intransitive) and お.える (o.eru, to finish — transitive) form another foundational intransitive/transitive pair. 終わる pairs with 始まる exactly.

The pair 始発 (first train) and 終電 (last train) define the daily commute window of every Japanese city dweller — the bookends of the train day.

Memory aid: thread (糸) + winter (冬) — the end of the thread, the end of the year, all endings.

午 was originally a picture of a pestle. Later it came to mark the seventh animal of the twelve Earthly Branches — the Horse — and the hour when the sun stands at the center of the sky: noon. In the old timekeeping system the hour of 午 (11 a.m.–1 p.m.) is when the sun is highest.

Mandarin: wǔ, 3rd tone. 中午 (zhōngwǔ, noon), 上午 (shàngwǔ, morning / a.m.), 下午 (xiàwǔ, afternoon / p.m.), 午饭 (wǔfàn, lunch). The zodiac Horse is also 午 — 午马 (wǔmǎ).

Japanese: on-reading ゴ (go), kun うま (uma, horse). 午前 (gozen, a.m.), 午後 (gogo, p.m.), 正午 (shōgo, noon), 子午線 (shigosen, meridian). In Japanese tradition the direction of 午 (the Horse) is due south.

Korean hanja-sound "o": 午前 (ojeon, a.m.), 午後 (ohu, p.m.), 正午 (jeongo, noon), 端午 (Dano, the fifth-month festival). Because 午 (noon) faces 子 (midnight) exactly opposite, the word 子午線 (jaoseon, meridian / the line of longitude) was born here.

Memory aid: the sun standing at the middle of the sky at midday — the exact opposite of 子 (midnight).

Phonetic-semantic compound: 女 (woman) + 台 (a phonetic with the historical sense of "platform / foundation"). The original meaning anchors "beginning" in human procreation — a woman conceiving / receiving life. The most foundational "first / start" is the start of a life. Identical across 繁體 / 新字体 / 简体. Pairs perfectly with 終 / 终 (end) — 始終 (shǐzhōng / shijū / sijong) means "from beginning to end" in all three languages.

Mandarin: shǐ, dipping 3rd tone. 开始 (kāishǐ, to begin / the beginning) is the everyday word — every Chinese textbook chapter starts with the word 开始. 始终 (shǐzhōng, "from start to finish" / "always"), 原始 (yuánshǐ, original / primitive), 创始 (chuàngshǐ, to found / inaugurate), 始祖 (shǐzǔ, founder / progenitor).

Japanese: on-reading シ (shi) for compounds — 開始 (kaishi, start), 始発 (shihatsu, first train / first departure — every Japanese commuter knows this word), 原始 (genshi, primitive / primeval — 原始時代 = prehistoric era), 創始者 (sōshisha, founder). Kun-reading は.じめる (haji.meru, to start something — transitive) and は.じまる (haji.maru, to begin — intransitive). The transitive/intransitive pair はじめる/はじまる is one of the foundational verb-pairs: 私は仕事を始める (I start work) vs 仕事が始まる (work starts).

始発 (shihatsu) — "first departure" — is essential vocabulary for anyone using Japanese trains. The first 始発電車 (shihatsu densha) of the morning is around 5:00 AM in Tokyo and is a cultural touchstone — there are 始発で帰る (going home on the first train, after staying out all night) and 始発で行く (catching the first train) phrases that anchor entire Japanese social rituals.

Memory aid: woman + foundation — life beginning, the most fundamental "start".

Compound ideograph: 止 (foot/footprint) on top + 儿 (a person, the legs-radical form) below. The picture: a foot striding ahead while the rest of the person follows. Encoded meaning: "the one who went first." Identical across 繁體 / 新字体 / 简体.

The key compound across CJK is 先生 ("the one born first / the elder") — a single word that adapted differently in each language: — Mandarin 先生 (xiānsheng): now means "Mister" or "Sir". 王先生 (Wáng xiānsheng) = "Mr. Wang". Used as a polite address, no longer specifically meaning teacher. — Japanese 先生 (sensei): still means "teacher / doctor / professor / master" — the classical respect-for-elder sense survived. Used for school teachers, doctors, lawyers, and martial arts masters. NEVER use sensei for yourself. — Korean (seonsaeng): also "teacher" — same as Japanese. This split — Mandarin generalizing to "Mister", Japanese/Korean preserving "teacher" — is one of the most useful CJK comparative facts to know.

Mandarin: xiān, level 1st tone. 先 (xiān, first), 首先 (shǒuxiān, first of all), 先后 (xiānhòu, before-and-after / order), 优先 (yōuxiān, priority), 先进 (xiānjìn, advanced — "first-advancing"), 祖先 (zǔxiān, ancestor — "elder first").

Japanese: on-reading セン (sen) is dominant — 先生 (sensei, teacher), 先週 (senshū, last week), 先月 (sengetsu, last month), 先輩 (senpai, senior — at school or work), 先頭 (sentō, head/lead). Kun-readings: さき (saki, ahead / tip / point) — 先に (saki ni, first / earlier / ahead), 行き先 (ikisaki, destination — "going-ahead"); まず (mazu, "first of all", a sentence-starting adverb).

The school/work hierarchy concept of 先輩 / 后辈 (senior / junior) — senpai-kōhai in Japanese — anchors classroom and office relationships in Japan, Korea, and traditional Chinese contexts. Knowing 先 is essential for understanding social structure.

Memory aid: a footprint on top, person below — the one who walked ahead.

元 emphasizes the head of a person (儿, legs) with two strokes (二) on top — the original meaning is "head," the topmost part of a person. Since the head is the body's chief and starting point, the sense grew into "first, origin, source." The original meaning survives in 元首 (head of state).

Mandarin: yuán, 2nd tone. Above all, it is the unit of Chinese currency — 元 (yuán), as in 一元 (yī yuán, one yuan). 元旦 (yuándàn, January 1st), 公元 (gōngyuán, the Common Era / A.D.), 元素 (yuánsù, chemical element). It is also the dynasty name of the Mongol-founded 元朝 (Yuáncháo, the Yuan dynasty, 1271–1368).

Japanese: on-readings ゲン (gen) and ガン (gan), kun もと (moto). 元気 (genki, healthy / lively — "source energy"), 元旦 (gantan, New Year's morning), 元 (moto, originally). The first year of a new Japanese imperial era is called 元年 (gannen).

Korean hanja-sound "won": 元來 (wollae, originally), 元旦 (wondan, New Year's morning), 紀元 (giwon, era / epoch). The Mongol Yuan dynasty, which influenced the Korean peninsula between Goryeo and Joseon, is also 元 (Won).

Memory aid: above a person (儿), two strokes (二) pointing at the head — the topmost, the very first.

紀 is a phonetic-semantic compound: 糸 (silk thread) + 己 (jǐ, "self" — providing the sound). The original meaning was concrete: the leading thread / main strand of a woven fabric — what one organizes the rest of the threads around. From this textile origin grew an extraordinary semantic chain: leading thread → guiding principle / standard → record / chronicle → era / generation. The character documents how the East Asian conception of "era" developed from the practical metaphor of "the thread that organizes the cloth."

Korean reading "gi." 世紀 (segi, century — used universally for "21st century" etc.), 紀元 (giwon, era / epoch — used in giwon-jeon "BC" and giwon-hu "AD"), 紀錄 (girok, record — though modern Korean increasingly writes this with 記錄), 紀念 (ginyeom, commemoration — though 記念 is now standard), 風紀 (punggi, public morals / social discipline — punggi-mullan denotes "moral degeneracy"). The "record" sense in Korean has largely shifted to 記 (also gi), with 紀 reserved for "era / chronicle."

Mandarin jì, 4th tone (simplified 纪). 世纪 (shìjì, century — universal modern time vocabulary), 纪录 (jìlù, record), 纪念 (jìniàn, commemoration), and the politely formal 年纪 (niánjì, "year-thread" = age — used as a polite alternative to 岁数 suìshù: 你多大年纪? "How old are you?" is more deferential than the casual 你几岁?). 纪律 (jìlǜ, "thread-rule" = discipline — central to Chinese institutional vocabulary, especially Communist Party 党纪 dǎngjì "party discipline").

Japanese on-reading キ (ki) — 世紀 (seiki, century), 紀元 (kigen, era / epoch — 紀元前 kigen-zen "BC"), 紀行 (kikō, "travel chronicle" = travelogue — a recognized Japanese literary genre, with classics like Bashō's 奥の細道 Oku no Hosomichi being a 紀行文学 travel literature). The 21st century 二十一世紀 (nijūichi seiki) is everyday Japanese vocabulary.

Memory aid: silk thread (糸) and self (己) — the leading thread that organizes everything else became "era" and "record."

Compound character: a person (亻) beside a moon (月) or stars. The encoded definition is gentler than English "night" — not "deep darkness" but "the time when a person stands under the moon". The poetic angle: ancient scribes defined night by lunar companionship rather than absence of light. Identical across 繁體 / 新字体 / 简体. Pairs with 昼 (daytime) as the day/night opposition.

Mandarin: yè, falling 4th tone. 夜 in modern Mandarin feels slightly literary — the everyday word for "night" leans toward 晚上 (wǎnshang). But 夜 dominates compound vocabulary: 夜晚 (yèwǎn, night), 夜里 (yèli, in the night), 夜班 (yèbān, night shift), 熬夜 (áoyè, to stay up late / pull an all-nighter), 半夜 (bànyè, midnight), 黑夜 (hēiyè, dark night), 夜市 (yèshì, night market — a Taiwanese cultural institution).

Japanese: on-reading ヤ (ya) for compounds — 夜間 (yakan, nighttime — formal), 徹夜 (tetsuya, all-nighter / staying up all night — important student/work vocabulary), 深夜 (shin'ya, deep night / late night), 夜中 (yonaka, middle of the night — irregular reading: kun + on hybrid), 夜行 (yakō, night-flying / night-traveling — used for night trains and night buses). Kun-readings: よる (yoru) and よ (yo) — 夜 (yoru, night), 月夜 (tsukiyo, moonlit night).

The Japanese keyword 徹夜 (tetsuya, "all-nighter") is essential cultural vocabulary — Japanese students and workers regularly 徹夜 to finish reports or study, dramatized in countless dramas and anime.

Memory aid: a person standing beside the moon — night defined by lunar companionship.

A poetic compound: the sun (日) rising over grass, with the moon (月) still hanging in the sky on the right side. The encoded scene is exactly that quiet dawn moment when both the sun and the unset moon share the sky — a short, transitory time. The middle of 朝 holds the abstracted grass component; the right side is the moon. Identical across 繁體 / 新字体 / 简体.

Double meaning: "morning" + "imperial court / dynasty". Why? Because Chinese emperors traditionally held court at dawn — the time when ministers gathered to receive instruction. So 朝廷 (cháotíng / chōtei, imperial court), 王朝 (wángcháo / ōchō, dynasty), and 朝代 (cháodài, dynasty period) all derive from "the morning audience". This double-life of 朝 (morning + dynasty) is one of the most important historical-vocabulary keys for reading classical CJK texts.

Mandarin has TWO tones for 朝 — another 破音字: — zhāo (1st tone): morning. 朝阳 (zhāoyáng, morning sun), 朝气 (zhāoqì, morning vigor), 早朝 (zǎocháo, early morning audience). — cháo (2nd tone): dynasty / facing toward. 朝代 (cháodài, dynasty), 唐朝 (Táng Cháo, Tang Dynasty), 朝鲜 (Cháoxiǎn, Korea — the historical name), 朝向 (cháoxiàng, facing direction).

Japanese: on-reading チョウ (chō) for compounds — 朝食 (chōshoku, breakfast — formal), 朝刊 (chōkan, morning newspaper), 王朝 (ōchō, dynasty), 朝廷 (chōtei, imperial court). Kun-reading あさ (asa) is the everyday word — 朝 (asa, morning), 朝ご飯 (asagohan, breakfast — informal), 朝日 (asahi, morning sun — also a major newspaper name), おはよう (ohayō, "good morning" — written 御早う but rarely with kanji).

Korea's historical name 朝鮮 (Joseon) — and the modern (DPRK) — uses this character: "morning-fresh land", a poetic dynasty name from the 14th century.

Memory aid: sun rising through grass with moon lingering — the morning court hour.

Phonetic-semantic compound: 辶 (walking radical) + 周 (circumference / cycle). The encoded meaning: "moving in a complete cycle" = a week. Originally 周 alone carried the cyclical meaning; later scribes added 辶 to specify "the unit of cyclical movement", giving us today's 週.

Mainland Chinese simplification removes 週 entirely. Instead of 週, simplified Chinese uses just 周 — making this one of the very rare cases where a character is removed rather than simplified in form. So: — 繁體 (Traditional, Hong Kong, Taiwan): 週 for "week". — 新字体 (Japan): 週 — kept the traditional form. — 简体 (Mainland China): 周 (the same 周 that means "circumference") does double duty as both meanings.

Mandarin: zhōu, level 1st tone (using 周 in mainland China). 周末 (zhōumò, weekend), 周日 (zhōurì, Sunday), 一周 (yīzhōu, one week), 周年 (zhōunián, anniversary). Mandarin's spoken word for "week" is 星期 (xīngqī, "star period"), with 周 used in formal/written contexts.

Japanese: on-reading シュウ (shū) is dominant for 週 — 週末 (shūmatsu, weekend), 今週 (konshū, this week), 先週 (senshū, last week), 来週 (raishū, next week), 毎週 (maishū, every week), 一週間 (isshūkan, one week). The full set 先週/今週/来週 is among the foundational time-vocabulary every Japanese learner masters.

Kun-reading is essentially absent — 週 is exclusively on-reading シュウ in Japanese practice.

Memory aid: a journey (辶) around a circle (周) — one full circuit equals a week.

Compound ideograph: 日 (sun) on top + 十 (in the original an early form representing a sprouting plant or grass — "below" the sun). The encoded image: the sun has just risen above the level of fresh grass. That early-morning moment defines "early / morning". Identical across 繁體 / 新字体 / 简体.

Mandarin: zǎo, dipping 3rd tone. 早 is one of the most useful early-vocabulary words in Mandarin: 早! (zǎo!) — said alone, means "Good morning!" — the entire greeting compressed to one syllable. Fuller forms: 早上 (zǎoshang, morning), 早安 (zǎo'ān, "morning peace" = good morning), 早晨 (zǎochén, dawn), 早饭 (zǎofàn, breakfast — "morning food"), 迟早 (chízǎo, sooner or later), 早就 (zǎojiù, long ago / for a long time already).

Japanese: on-reading ソウ (sō) for compound vocabulary — 早朝 (sōchō, early morning), 早急 (sōkyū, urgent), 早期 (sōki, early stage). Kun-reading は.やい (ha.yai) covers BOTH "early" AND "fast / quick" — Japanese learners must be alert to the dual meaning. 早い (hayai) = early in time OR fast in speed; the disambiguating partner 速い (also hayai, but written with 速 = fast) covers physical speed, but everyday 早い handles both. So 朝早い (asa hayai) = "early in the morning", 走るのが早い (hashiru no ga hayai) = "runs fast".

The greeting お早う (ohayō) — Japan's "good morning" — is shortened from お早うございます (ohayō gozaimasu, polite form). The casual version おはよう (ohayō) is used among friends, families, and colleagues. The original literal sense was "you are early!" — a compliment to someone who had risen before noon.

Memory aid: sun rising over fresh grass — the early-morning light made into a word.

Compound ideograph with a poetic encoding: 十 (ten) on top + 口 (mouth) below. The story: "what has passed through ten mouths" — knowledge or news that has been retold so many times across generations that it qualifies as ancient. Ten generations of oral transmission = old. Identical across 繁體 / 新字体 / 简体.

This etymology rewards memorization because the character is a direct compositional check: when you see 十 + 口 = 古, you know the meaning is "ancient / old". Pairs with 新 (new — next entry) as one of the fundamental temporal oppositions.

Mandarin: gǔ, dipping 3rd tone. 古代 (gǔdài, ancient times), 古老 (gǔlǎo, ancient / time-honored), 古典 (gǔdiǎn, classical), 古迹 (gǔjī, historic site), 考古 (kǎogǔ, archaeology — "investigating the ancient"), 古玩 (gǔwán, antique). Pairs with 现代 (xiàndài, modern era) and 古代 in historiographic vocabulary.

Japanese: on-reading コ (ko) — 古代 (kodai, ancient era), 古典 (koten, classics), 中古 (chūko, second-hand / used — important for online shopping vocabulary). The Japanese 中古車 (chūkosha) market — used cars — is enormous, and the term means "middle-old car". Kun-reading ふる.い (furu.i) is the everyday adjective — 古い (furui, old / used / outdated), 古本 (furuhon, used book — note rendaku voicing), 古着 (furugi, used clothing).

古い vs 老い (oi): both can mean "old" in English, but 古 is for things (古い建物 = old building) while 老 is for people (老人 = elderly person). Japanese learners must keep these separate; calling a person 古い (furui) is grammatical but rude — implying they're obsolete.

Memory aid: ten mouths telling the same story — ancient by repetition.

Compound ideograph: grass (艸 — abstracted into the upper strokes) above 日 (sun). The encoded scene: fresh grass sprouting under the sun. Spring captured as the literal moment vegetation responds to lengthening daylight. Identical across 繁體 / 新字体 / 简体. The character has stylized over millennia until the grass component is barely recognizable, but the etymology remains vivid.

Like many CJK season-words, 春 carries metaphorical weight beyond literal spring. It encodes "youth / new beginning / vitality": 青春 (qīngchūn / seishun, "blue-spring" = youth, springtime of life — a cultural keyword in Japanese coming-of-age literature and anime), 春情 (chūnqíng / shunjō, romantic feelings — "spring emotion").

Mandarin: chūn, level 1st tone. 春天 (chūntiān, spring), 春节 (Chūnjié, Chinese New Year — by far the most important annual festival, anchored at the lunar new year and the start of spring), 春风 (chūnfēng, spring wind / kindly influence), 青春 (qīngchūn, youth), 春联 (chūnlián, Spring Festival couplets — the red-paper poems pasted on doorframes).

Japanese: on-reading シュン (shun) for compounds — 青春 (seishun, youth — central Japanese cultural concept, drives entire genres of manga/anime), 新春 (shinshun, New Year / new spring — a polite seasonal greeting in January), 立春 (risshun, "establishment of spring" — the official start of spring around February 4 in the East Asian solar calendar). Kun-reading はる (haru) is the everyday word — 春 (haru, spring), 春休み (haruyasumi, spring break), 春一番 (haru ichiban, "first storm of spring" — the gusty wind that signals winter's end). And in food vocabulary: 春巻き (harumaki, spring rolls).

The Japanese cultural keyword 青春 (seishun) has no perfect English equivalent — it captures the bittersweet, fleeting nature of youth, the school years, first loves, summer break feelings — all bundled into "blue-spring".

Memory aid: grass + sun = the season grass remembers how to grow.

Compound character: 步 (footsteps / walking) + 戌 (an axe / Year-of-the-Dog signal). The encoded meaning: "the steps of a year, marked with an axe-cut" — the agricultural cycle ending in harvest and sacrificial offering. Where 年 is the ordinary year-cycle (from earlier batches), 歲 carries weightier ceremonial connotation: ages, eras, dignified time. Three forms: 繁體 歲 / 新字体 歳 / 简体 岁 (the most diverged simplification — Chinese radically reduced the strokes).

The primary modern usage is for COUNTING AGE in years — and this is one of the most everyday CJK vocabulary items.

Mandarin: suì, falling 4th tone (simplified 岁). 几岁? (Jǐ suì? "How old?" — used for children) is among the first questions a Mandarin learner masters. 二十岁 (èrshí suì, 20 years old), 岁数 (suìshu, age — neutral final tone), 万岁 (wànsuì, "ten thousand years!" — the famous cheer for emperors and political leaders). Note that for adults, more polite forms like 年纪 / 年龄 are sometimes preferred, but 岁 remains universal.

Japanese: on-reading サイ (sai) — 二十歳 (irregular kun-reading hatachi — "20 years old", THE coming-of-age milestone in Japan, celebrated as 成人式), 歳末 (saimatsu, year-end — every Japanese department store does 歳末 sales), 万歳 (banzai, "Long live!" cheer — this is the same character but pronounced differently from 万歳 in older Buddhist contexts). Kun-reading とし (toshi) — same kun-reading as 年 (year, batch K.6), the two characters share much vocabulary. お歳暮 (oseibo, year-end gift — a major Japanese gift-giving season).

The Japanese 二十歳 (hatachi) — turning 20 — is a culturally weighty milestone with formal ceremonies, kimono dressing, and government recognition. Mastering this character is essential for navigating Japanese age etiquette.

Memory aid: a year measured by footsteps + axe — the cyclical agricultural year, weighted with ceremony.

Phonetic-semantic compound: 日 (sun / day) + 乍 (suddenly / momentarily). The encoded meaning: "the day that just barely passed" = yesterday. Identical across 繁體 / 新字体 / 简体.

Mandarin: zuó, rising 2nd tone. 昨天 (zuótiān, yesterday — the everyday word), 昨晚 (zuówǎn, last night), 昨日 (zuórì, yesterday — formal/written), 昨夜 (zuóyè, last night — formal/poetic). The pair 昨天/明天 (yesterday/tomorrow) is foundational time vocabulary, taught alongside 今天 (today).

Japanese: on-reading サク (saku) for compounds — 昨日 (sakujitsu, yesterday — formal), 昨年 (sakunen, last year — formal), 昨夜 (sakuya, last night — formal). However — and this is critical — the everyday Japanese word for "yesterday" uses an irregular kun-reading hybrid: — 昨日 can be read さくじつ (sakujitsu, formal) OR きのう (kinō, casual / everyday). — The reading きのう is one of the most common irregular kanji compounds in Japanese, reflecting an older Japanese word that got assigned to 昨日 in writing.

This split — formal sakujitsu vs. casual kinō — is among the foundational duplicate-reading patterns Japanese learners must memorize. In speech, きのう dominates; in news and formal writing, さくじつ appears.

The related word for "tomorrow" — 明日 — has the same dual structure: あした (ashita, casual) or あす (asu, slightly formal) or みょうにち (myōnichi, very formal). Three different readings for the same kanji compound, reflecting register.

Memory aid: sun + a moment ago = yesterday.

Oracle bone 夏 pictured a person with head, hands, and feet all spread out — the largest, most expansive human pose. The summer-meaning emerged from this "biggest, most active" association. Identical across 繁體 / 新字体 / 简体.

A fascinating cultural note: 夏 was also the name of the legendary first Chinese dynasty (Xia, c. 2070–1600 BCE), and "華夏 / 华夏" (Huáxià) became one of the classical self-designations for the Chinese people themselves. So this character carries the weight of both "the active season" and "us — the ancient civilization". The English term "Sino-" derives indirectly through this etymological route via 秦 (Qin), but 華夏 remains the dignified internal name.

Mandarin: xià, falling 4th tone. 夏天 (xiàtiān, summer), 夏季 (xiàjì, summer season), 夏令时 (xiàlìngshí, daylight saving time), 立夏 (lìxià, "establishment of summer" — the East Asian solar calendar marker around May 5). The dynasty name is also 夏朝 (Xià Cháo).

Japanese: TWO on-readings. カ (ka) is more common — 夏期 (kaki, summer period), 初夏 (shoka, early summer). ゲ (ge) appears in 夏至 (geshi, summer solstice — June 21). Kun-reading なつ (natsu) is the everyday word — 夏 (natsu), 夏休み (natsuyasumi, summer vacation — every Japanese student's favorite phrase), 真夏 (manatsu, midsummer), 夏祭り (natsumatsuri, summer festival), 夏服 (natsufuku, summer clothes / school uniforms).

The Japanese 夏祭り (summer festivals) — yukata-clad street festivals with paper lanterns, taiko drums, and shaved ice — anchor the entire summer cultural calendar in Japan, dramatized in countless anime and movies.

Memory aid: a person stretched wide — the season of full bloom.

Compound ideograph: 禾 (grain stalks / rice plant — note this is rice ready for harvest, not just any grain) + 火 (fire). Two competing readings: (1) the golden-red color of ripe grain in late summer fields, like flame; (2) the literal practice of burning crop stubble after harvest. Either way: autumn = harvest time. Identical across 繁體 / 新字体 / 简体.

秋 anchors the autumn season in CJK calendars and mid-autumn festivals: 中秋節 / 中秋节 (Mid-Autumn Festival, the second-most-important Chinese holiday after Lunar New Year, celebrated with mooncakes 月餅), 立秋 (the official start of autumn around August 7), 秋分 (autumn equinox).

Mandarin: qiū, level 1st tone. 秋天 (qiūtiān, autumn / fall), 秋季 (qiūjì, autumn season), 中秋 (Zhōngqiū, Mid-Autumn — both the festival and the season), 秋风 (qiūfēng, autumn wind), 春秋 (Chūnqiū, "Spring and Autumn" — also the name of an ancient Chinese era, 770–476 BCE, and a classical text). The compound 春秋 generally means "history" or "the years" in classical contexts.

Japanese: on-reading シュウ (shū) for compounds — 秋分 (shūbun, autumn equinox), 中秋 (chūshū, mid-autumn), 立秋 (risshū, start of autumn), 春夏秋冬 (shunkashūtō, four seasons — the formal compound). Kun-reading あき (aki) is the everyday word — 秋 (aki, autumn), 秋風 (akikaze, autumn wind), 秋祭り (akimatsuri, autumn festival), 秋空 (akizora, autumn sky).

Korean Chuseok (秋夕 — Korean Thanksgiving / mid-autumn harvest festival) is the most important Korean holiday alongside Seollal. Same character, same season. The Korean tradition is family reunion, ancestor honoring, and rice cake (songpyeon).

Memory aid: rice + fire — the fields burning gold at harvest.

季 is a compound ideograph: 禾 (a stalk of grain — millet or rice with drooping head) + 子 (child / young one). The composite captures "young grain" — the early-stage rice or millet that marks the beginning or end of an agricultural cycle. From this concrete agricultural origin grew the abstract sense "season / period / cyclical time." A second meaning emerged from family hierarchy: classical Chinese ranked siblings as 伯 (eldest), 仲 (second), 叔 (third), 季 (youngest) — the youngest sibling held the 季 position. So 季 carries both seasonal and "youngest in birth order" senses.

Korean reading "gye." 季節 (gyejeol, season — universal Korean term for the four seasons), 四季 (sagye, four seasons), 秋季 (chugye, autumn season — used in "fall sports day"), 夏季 (hagye, summer season), 季刊 (gyegan, "seasonal publication" = quarterly journal), 伯仲叔季 (baekjung-sukgye, the four classical sibling positions — referenced in literary and historical writing about family hierarchies).

Mandarin jì, 4th tone. 季节 (jìjié, season), 四季 (sìjì, four seasons), 季度 (jìdù, quarter — fiscal/business quarters: 第一季度 first quarter), 赛季 (sàijì, "competition season" = sports season — used for soccer leagues, NBA, e-sports: NBA赛季). The compound 赛季 entered Mandarin as Western sports leagues entered the country, becoming standard sports vocabulary.

Japanese on-reading キ (ki) — 季節 (kisetsu, season), 四季 (shiki, four seasons — central to Japanese aesthetics), 夏季 (kaki, summer season), 冬季 (tōki, winter season — used in 冬季オリンピック "Winter Olympics"), 季刊 (kikan, quarterly publication). Japan's reverence for seasonal awareness elevates 四季 (shiki) to central cultural status: traditional poetry forms like haiku require seasonal kigo (季語), traditional cuisine emphasizes 旬 (shun, peak-season ingredients), and tea ceremony explicitly seasonalizes its utensils and motifs. Vivaldi's Four Seasons in Japanese is simply 四季 (Shiki), no further translation required — the concept is already deeply Japanese.

Memory aid: young grain (禾 + 子) — the seasonal cycle marked by rice growing.

The traditional 齡 is a phonetic-semantic compound: 齒 (tooth) + 令 (lìng, "order / command" — providing the sound). The composite reads as "what is gauged by examining teeth" = age. The etymology is wonderfully practical and survives to modern veterinary practice: ranchers and horse traders examine an animal's teeth to estimate its age. The wear pattern, the angle of incisors, the presence or absence of milk teeth — all of these tell a trained eye how old a creature is. The character preserves this folk knowledge across three thousand years. Japan simplified to 齢, Mainland China to 龄.

Korean reading "ryeong" (or "yeong" word-initially). 年齡 (yeollyeong, age — the most formal Korean term for asking someone's age), 高齡 (goryeong, advanced age), 適齡 (jeokryeong, proper age — used in gyeolhon-jeokryeonggi "marriageable age"), 老齡化 (noryeong-hwa, "aging" as demographic phenomenon — major Korean policy topic given Korea's rapid population aging), 結婚適齡期 (gyeolhon-jeokryeonggi, "marriageable age").

Mandarin líng, 2nd tone (simplified 龄). 年龄 (niánlíng, age — used widely in form-filling), 高龄 (gāolíng, advanced age), 适龄 (shìlíng, of suitable age — 适龄儿童 "school-age children"), 龄期 (língqī, age stage). The simplified form 龄 is significantly easier to write than the traditional 齡, even though the meaning is identical.

Japanese on-reading レイ (rei) — 年齢 (nenrei, age — used in formal questionnaires and statistics: 平均年齢 heikin nenrei "average age"), 高齢 (kōrei, advanced age), 適齢期 (tekireiki, "appropriate-age period" — implicitly referring to marriageable age, though increasingly contested as a social concept), 老齢 (rōrei, old age), 高齢者 (kōreisha, "advanced-age person" = senior citizen — a critical demographic and policy term given Japan's super-aged society where over 28% of population is 65+). Japan's 高齢化社会 (kōreika shakai, "aging society") and even 超高齢社会 (chōkōrei shakai, "super-aged society") are central to public discourse.

Memory aid: tooth (齒) plus 令 (sound) — measuring age by examining teeth.

A character with split etymology. Originally 冬 pictured a thread tied at both ends — the same "end of thread" image as 終 (end, from earlier batch). Both 冬 and 終 share a common ancestor — the knot that closes off a series. As the meanings diverged, 冬 absorbed 冫 (ice — the two-dot ice radical) at the bottom, encoding "the end of the year + frost" = winter. Identical across 繁體 / 新字体 / 简体.

Four-season set complete with this entry: 春夏秋冬 (spring-summer-autumn-winter), the foundational temporal sequence in CJK culture. The phrase 春夏秋冬 reads in order as shun-ka-shū-tō in Japanese — the entire calendar in four syllables.

Mandarin: dōng, level 1st tone. 冬天 (dōngtiān, winter), 冬季 (dōngjì, winter season), 冬至 (Dōngzhì, winter solstice — December 21–22, traditionally celebrated with dumplings in northern China and tangyuan glutinous rice balls in the south), 冬眠 (dōngmián, hibernation), 冬奥会 (Dōng'àohuì, Winter Olympics).

Japanese: on-reading トウ (tō) for compounds — 冬季 (tōki, winter season), 冬至 (tōji, winter solstice), 冬眠 (tōmin, hibernation), 立冬 (rittō, start of winter — November 7). Kun-reading ふゆ (fuyu) is the everyday word — 冬 (fuyu, winter), 冬休み (fuyuyasumi, winter vacation), 真冬 (mafuyu, midwinter), 冬服 (fuyufuku, winter clothes / winter uniform).

With 冬 we complete the four-season vocabulary that English-speaking learners can immediately use: spring 春 (haru/chūn), summer 夏 (natsu/xià), autumn 秋 (aki/qiū), winter 冬 (fuyu/dōng).

Memory aid: a knot at the year's end, with ice crystals at the bottom — winter as the close of the cycle.

候 is a phonetic-semantic compound: 亻 (person) + 矦 (hóu, originally an archery target / arrow stand — providing the sound). The composite reads as "a person watchful, waiting for a signal" = to scout, observe, await. From this concrete watching-and-waiting image grew an extraordinary range of meanings: scouting → signs / symptoms (what one watches for) → climate (long patterns observed over time) → candidate (one waiting for selection) → inquiry after someone's well-being (asking how they fare).

Korean reading "hu." 氣候 (gihu, climate — used for both weather climate and metaphorical political climate), 徵候 (jinghu, sign / symptom — medical and social), 候補 (hubo, candidate — used in elections), 測候所 (cheukhuso, "observation-waiting station" = weather observation post), 問候 (munhu, "inquiring after well-being" = formal greeting / regards — used in letters: "I always inquire after your well-being").

Mandarin hòu, 4th tone. 候 (hòu), 气候 (qìhòu, climate), 时候 (shíhou, "time-period" = time / moment / when — extremely common: 什么时候 shénme shíhou "when?"), 等候 (děnghòu, to await), 候补 (hòubǔ, candidate / alternate). 时候 (shíhou) is essential everyday vocabulary; almost every Mandarin sentence about time uses 时候.

Japanese on-reading コウ (kō) — 気候 (kikō, climate), 徴候 (chōkō, sign / indication), 測候所 (sokkōjo, weather observation station). And distinctively, the kun-reading そうろう (sōrō) preserves a unique register of Japanese: 候 functioned as the formal copula in Edo-period (江戸時代) writing — the verb meaning "to be / to exist / to be the case" used in samurai correspondence and official documents. The result was an entire prose style called 候文 (sōrōbun, "sōrō-style writing"), which permeated samurai letters, official decrees, and historical novels. Reading classical Japanese requires recognizing 候 as a syntactic marker: 「~に候」 (~ni sōrō, "is in the state of ~"). Modern Japanese has fully replaced sōrō with the polite copula です/ます, but historical-fiction readers and historians still encounter this character constantly.

Memory aid: a person (亻) watching from an arrow stand (矦) — observing, waiting, anticipating signs.

Phonetic-semantic compound: 日 (sun) + 免 (release / free oneself, providing phonetic value). The encoded image: the sun "releasing itself" from its high noon position — descending toward the horizon. Three forms: 繁體 晚 / 新字体 晩 / 简体 晚 (the simplified and traditional kept the same form; Japanese shinjitai slightly modified the right side). Pairs perfectly with 早 (early / morning) as opposites.

Mandarin: wǎn, dipping 3rd tone (simplified 晚). 晚 (wǎn, late / evening), 晚上 (wǎnshang, evening / night — "the late time"), 晚饭 (wǎnfàn, dinner — "late meal"), 晚安 (wǎn'ān, good night — "evening peace"), 太晚 (tài wǎn, too late), 早晚 (zǎowǎn, sooner or later). 晚安 is the standard Chinese "good night" greeting — saved alongside 早 (zǎo) for "good morning".

Japanese: on-reading バン (ban) for compounds — 晩餐 (bansan, formal dinner), 今晩 (konban, this evening / tonight), 毎晩 (maiban, every evening), 晩年 (bannen, later years of life). 今晩は (Konbanwa) — "good evening" — is one of the foundational Japanese greetings every learner masters: 朝 → おはよう (morning), 昼 → こんにちは (daytime), 晩 → こんばんは (evening). The greeting structure follows the time-of-day kanji exactly.

No widely used kun-reading exists; 晩 is dominantly an on-reading character.

The compound 晩学 (bangaku, "late learning") describes someone who pursues education later in life — used encouragingly in modern Japan to praise career changers and elderly students.

Memory aid: sun + release = the time when the sun lets go of the day.

The traditional 晝 is a compound ideograph: 聿 (a brush held in hand) + 旦 (sunrise / morning, depicting the sun above the horizon). The original etymology suggests "the time when the brush divides morning from evening" — the day-bright period. Japan (shinjitai) and Mainland China (simplified) both adopted the same simplified form 昼; Korea retains the traditional 晝. Three regions, two scripts.

Korean reading "ju." 晝間 (jugan, daytime / day shift), 晝夜 (juya, "day and night" — used for round-the-clock operations), 白晝 (baekju, "broad daylight" — used in idioms like baekju-e in broad daylight). Korean preserves the traditional 晝 in formal writing, though everyday Korean uses the native (nat) for "daytime."

Mandarin zhòu, 4th tone. 白昼 (báizhòu, daytime — formal), 昼夜 (zhòuyè, day and night — formal), 昼伏夜出 (zhòufú yèchū, "hide by day and emerge by night" — describes nocturnal animals or stealth operations). However, modern colloquial Chinese strongly prefers 白天 (báitiān, "white sky" = daytime) for everyday speech; 昼 is reserved for literary and idiomatic register.

Japanese keeps 昼 actively in everyday vocabulary. On-reading チュウ (chū) — 昼食 (chūshoku, lunch — formal), 昼夜 (chūya, day and night). Kun-reading ひる (hiru) is what Japanese speakers use constantly: 昼 (hiru, noon / midday / lunch — meaning all three), 昼ご飯 (hirugohan, "noon rice" = lunch — extremely common), 昼休み (hiruyasumi, "noon break" = lunch break / midday rest), 昼間 (hiruma, daytime). When Japanese say "let's eat 昼 (hiru)," everyone understands lunch. The character anchors all of Japan's midday vocabulary.

Memory aid: brush dividing the day from night — 晝 traditional, 昼 simplified. Korea uses 晝, Japan and Mainland China use 昼.

夕 is 月 (moon) with one stroke removed — the half-shown moon of early evening, not yet fully risen. When the moon is full up it is 月 (night); when it is just appearing it is 夕 (dusk). A delicate character that splits time out of the very same picture.

The characters that grow from 夕 are wonderful. 多 (duō, many) is two 夕 stacked — evenings piling up means "many". 名 (míng, name) is 夕 + 口 (mouth): in the dark when you cannot see a face, you call out a name with your mouth to identify someone.

Mandarin: xī, 1st tone. 七夕 (Qīxī, the 7th-night festival — the Cowherd-and-Weaver-Girl legend, China's Valentine's Day), 除夕 (chúxī, New Year's Eve night), 夕阳 (xīyáng, the setting sun).

Japanese: on-reading セキ (seki), kun ゆう (yū). 夕方 (yūgata, evening), 夕日 (yūhi, setting sun), and 七夕 (Tanabata) — the great star festival, read with a special native reading rather than the expected on-reading.

Korean hanja-sound "seok": 夕陽 (seokyang, sunset glow), 秋夕 (Chuseok). Korea's biggest holiday, 秋夕 — "autumn evening", the harvest full moon — carries this character.

Memory aid: the moon (月) with one stroke taken away — early dusk, the moon only half-risen.

曜 is a phono-semantic character: 日 (sun) for meaning and 翟 (a pheasant) for sound. Its original sense was "to shine, the light of sun and stars" — from which it came to denote the sun, moon, and five planets (the Seven Luminaries), and then the names of the days of the week.

The East Asian week, the 七曜 (Seven Luminaries), is the seven lights of sun, moon, Mars, Mercury, Jupiter, Venus, Saturn — 日曜 (Sun), 月曜 (Moon), 火曜, 水曜, 木曜, 金曜, 土曜. This seven-day cycle began in ancient Babylon, passed through India and China, and settled across East Asia — a globally shared week.

Korean hanja-sound "yo": 曜日 (yoil, day of the week), 七曜 (chiryo, the seven luminaries), 日曜日 (iryoil, Sunday). In Korean the days are usually written ~曜日, as in woryoil (Monday), hwayoil (Tuesday).

Mandarin: yào, 4th tone. In modern Chinese the days of the week are counted with 星期 (xīngqī, from the 星 entry seen earlier), so 曜 is rare, met mostly in Japanese loanwords or classical and literary use — 日曜 (rìyào).

Japanese: on-reading ヨウ (yō) — no kun-reading (on-only). 曜日 (yōbi, day of the week), 月曜日 (getsuyōbi, Monday), 日曜日 (nichiyōbi, Sunday), 土曜日 (doyōbi, Saturday). Japanese days of the week all end in ~曜日 (yōbi).

Memory aid: the sun (日) shining (翟) — from the seven lights (七曜) to the days of the week.

The traditional 壽 originated as a pictograph of an elderly figure: long flowing hair, a slightly bent posture, hand on a walking staff. From this depiction of advanced age grew the meanings: long-lived → long life → vital span → congratulatory wishes for long life. Japan and Mainland China both simplified to 寿; Korea retains 壽. Few characters carry as much ceremonial weight: 壽 / 寿 hangs on banners at every major birthday celebration in CJK cultures, especially the 60th and 70th milestone birthdays.

Korean reading "su." 長壽 (jangsu, longevity), 壽命 (sumyeong, lifespan), 無量壽 (muryangsu, "immeasurable life" — Buddhist term referring to Amitabha Buddha's eternal life-span; Muryangsujeon a temple hall dedicated to Amitabha), 萬壽無疆 (mansu-mugang, "ten-thousand longevities without limit" — formal birthday wish to elders, especially royals and dignitaries: "may you live ten thousand years"), 還甲壽宴 (hwangap-suyeon, 60th birthday banquet). Korean elder-respect culture is dense with su vocabulary.

Mandarin shòu, 4th tone. 寿 (shòu), 寿命 (shòumìng, lifespan), 长寿 (chángshòu, longevity), 寿星 (shòuxīng, "longevity star" = the guest of honor at a birthday celebration / the Daoist god of longevity), 祝寿 (zhùshòu, "to celebrate longevity" = to honor an elder's milestone birthday). Chinese birthday banquets feature 长寿面 (chángshòu miàn, "longevity noodles") — long uncut noodles symbolizing extended life.

Japanese on-reading ジュ (ju) — 寿命 (jumyō, lifespan), 長寿 (chōju, longevity). Kun-reading ことぶき (kotobuki, "auspicious congratulations / felicitations") — 寿 alone reads as kotobuki and serves as a generic word for "celebration / blessing." The character 寿 appears on Japanese New Year decorations and wedding gifts. Most charmingly: 寿司 (sushi) — the global Japanese culinary export — uses the same character 寿. The compound 寿司 was originally written 鮨 or 鮓 (with the fish radical — "fermented fish dish"), but Edo-period sushi vendors began using 寿司 as a more auspicious-looking ateji (kanji-substitution): "司 (sushi/sji) of 寿 (kotobuki, blessing)" — sushi as a "blessed dish." The kanji is purely phonetic, not semantic, but the propitious meaning made the substitution stick.

Memory aid: an elderly figure with long hair and a staff — long life, longevity, blessing.

旬 is a compound ideograph: 勹 (a wrapping / enclosing curve) + 日 (sun / day). The composite reads as "the wrapping of a sun-cycle" = ten days. Ancient East Asian calendars divided each month into three ten-day periods: 上旬 (first ten days), 中旬 (middle ten days), 下旬 (last ten days). The character preserves an entire pre-modern time-keeping framework that still survives in formal writing across CJK languages.

Korean reading "sun." 上旬 (sangsun, first ten days of a month), 中旬 (jungsun, middle ten days), 下旬 (hasun, last ten days), 初旬 (chosun, beginning of a month — synonym of sangsun). Korean writing maintains this division actively in formal contexts, marking time precisely such as the middle ten days of June or the first ten days of the following month. News articles and academic writing use 旬 vocabulary for time-precision.

Mandarin xún, 2nd tone. 旬 (xún, ten days), 上旬 (shàngxún), 中旬 (zhōngxún), 下旬 (xiàxún). Distinctively, Mandarin extends 旬 metaphorically to age-by-decade: 七旬老人 (qīxún lǎorén, "seventy-decade elderly" = a person in their 70s). Each 旬 = ten years in this idiomatic usage. So 八旬高龄 (bāxún gāolíng) = "eighty-decade elder." This decadal use of 旬 is unique to Mandarin among CJK languages.

Japanese on-reading ジュン (jun) covers calendar usage: 上旬 (jōjun, first ten days), 中旬 (chūjun), 下旬 (gejun). Japanese also has the alternate on-reading シュン (shun) carrying the most culinary-cultural meaning: 旬 (shun, "peak season / prime time" — applied especially to seasonal food). 旬の魚 (shun no sakana, "fish in season"), 旬の野菜 (shun no yasai, "vegetables at peak"), 旬の食材 (shun no shokuzai, "ingredients at their peak"). Japanese cuisine's deep reverence for seasonality treats 旬 as a sacred concept: eating asparagus in May, ayu (sweetfish) in summer, matsutake mushrooms in fall, fugu (blowfish) in winter. The slang extension applies to celebrities and trends: 旬のアイドル (shun no idoru, "idol at peak popularity"). Even popularity has its season.

Memory aid: wrapping a sun (日) cycle (勹) — ten days as one wrapped unit of time.

The character for "calendar" is one of the most visually divergent across CJK. Traditional 曆 is a phonetic-semantic compound: 厤 (lì, "succession of grain stalks / orderly arrangement") + 日 (sun / day). The original meaning was "the orderly record of sun and moon cycles" = calendar. The three regions then took different paths: Korea retains 曆, Japan adopted shinjitai 暦, Mainland China simplified to 历. One concept, three shapes — a paradigmatic CJK divergence case.

Korean reading "ryeok" (or "yeok" word-initially). 陽曆 (yangnyeok, solar calendar — Western Gregorian calendar), 陰曆 (eumnyeok, lunar calendar — traditional Korean lunar calendar still used for major holidays like Seollal and Chuseok), 西曆 (seoryeok, "Western calendar" = AD/CE dating system), 還曆 (hwallyeok, "returning calendar" = the 60th birthday — when one completes the full cycle of the 60-year sexagenary calendar and returns to the same year-name as one's birth), 萬歲曆 (manse-ryeok, "ten-thousand-year calendar" = perpetual calendar — used by Korean fortune-tellers).

Mandarin lì, 4th tone (simplified 历). And here Mandarin made a consequential simplification merge: 历 (jiǎntǐ) covers BOTH traditional 曆 (calendar) AND 歷 (history / experience). 历史 (lìshǐ, history — written 歷史 in traditional script), 日历 (rìlì, calendar — written 日曆 traditional), 阳历 (yánglì, solar calendar), 农历 (nónglì, "agricultural calendar" = lunar calendar). For learners moving between traditional and simplified scripts, the 历 = 歷 + 曆 merge is essential to track.

Japanese on-reading レキ (reki) — 西暦 (seireki, Western calendar / Gregorian dating — used as the standard reference in Japanese alongside the traditional era system 元号), 還暦 (kanreki, 60th birthday — major Japanese life milestone celebrated with red clothing, since the person symbolically "returns to childhood" by completing the sexagenary cycle). Kun-reading こよみ (koyomi) — 暦 (koyomi, calendar) — used poetically. 旧暦 (kyūreki, old / lunar calendar) and 新暦 (shinreki, new / solar calendar) are common in Japanese seasonal references.

Memory aid: orderly grain (厤) plus sun (日) — recording the sun's succession = calendar. Three different scripts: Korea 曆, Japan 暦, Mainland 历.