天文

天文 (tiānwén) is "heaven's writing": 文 is the same character as in 文字 (writing) and 文化 (culture), and its early sense was pattern, markings, the crossing lines on a surface. The sky was a text, and reading it was a state function. Imperial China maintained an astronomical bureau continuously for some two thousand years, because celestial events were politically legible: a comet or an unpredicted eclipse could signal that the dynasty's mandate was slipping. The observational records this bureaucracy produced (the supernova of 1054, returns of Halley's comet back to 240 BCE, sunspot observations centuries before European telescopes) are still mined by modern astronomers, which makes the imperial archives one of the longest-running datasets in science.

The modern discipline is 天文学, its practitioner a 天文学家, and the observatory a 天文台 (tiānwéntái), the same word that names the historic Beijing Ancient Observatory with its Ming-era bronze instruments. A separate word, 占星 (zhānxīng), covers astrology, and modern Chinese keeps the two as distinct as English does.

The five planets visible to the naked eye were correlated with the five phases (五行 wǔxíng) by Han times, so the weekly experience of a Chinese speaker includes cosmology: Mars is literally the fire star, and its reddish color made the assignment feel observational rather than arbitrary. Jupiter's older name 岁星, the "year star," reflects real astronomy, since its roughly twelve-year circuit of the sky calibrated the twelve earthly branches of the traditional calendar. The correlation runs deeper than names; the same five-phase grid organizes the seasons, directions, organs, and colors, and the planets were its celestial column.

Planets found after the telescope broke the pattern gracefully. Uranus became 天王星 and Neptune 海王星, translating the Greek sky-god and sea-god by sense. Pluto was 冥王星, the "underworld-king star," and when it was demoted in 2006 Chinese media had the same fun with the news as everyone else. Meanwhile 火星 has become one of the most-typed words in Chinese internet culture: 火星人 (Martian) is slang for someone hopelessly out of the loop, from the taunt 你是从火星来的吗 ("did you just arrive from Mars?").

Chinese sorts the sky with modifiers on 星 (xīng, star). A fixed star is a 恒星 (héngxīng, "constant star"); a planet is a 行星 (xíngxīng, "moving star"), the same wandering that gave Greek planetes its meaning; a satellite, natural or artificial, is a 卫星 (wèixīng, "guard star"), so a satellite dish is a 卫星天线 and a flagship's smaller companion city is jokingly its 卫星城. A comet is a 彗星 (huìxīng, "broom star"), named for the tail, and the folk name 扫把星 (sàobǎxīng, "broom star") is a live insult for a person who brings bad luck, a fossil of the old omen-reading in which comets swept away dynasties.

Two more members complete the set: 流星 (liúxīng, "flowing star") is a meteor, whence 流星雨 (meteor shower), and 卫星 in its state-media sense produced the Great Leap Forward idiom 放卫星 ("launch a satellite"), meaning to announce an inflated achievement, coined in 1958 when production miracles were reported alongside Sputnik-era enthusiasm. The morpheme also does celebrity duty: 明星 (míngxīng, "bright star") is the word for a star of screen or stage, and 追星 ("chasing stars") is fandom.

宇宙 (yǔzhòu, universe) is a two-character definition of spacetime that predates the physics by two millennia. The Han compendium Huainanzi (淮南子, 2nd century BCE) states it: all that is above, below, and in the four directions is called 宇; all past and present is called 宙. Space plus time, fused into the word for cosmos. Modern physics simply moved in: 宇宙学 is cosmology, 宇宙大爆炸 is the Big Bang ("the great cosmic explosion"), and 宇航员 (yǔhángyuán, "cosmos-voyaging personnel") is one of the words for astronaut, alongside 航天员 (hángtiānyuán, "heaven-sailing personnel"), the official term for Chinese crews, which English borrowed back as "taikonaut."

The space program names its hardware from the classical sky. The crewed spacecraft is 神舟 (Shénzhōu, "divine vessel," homophonous with 神州, an ancient name for China). The lunar probes are 嫦娥 (Cháng'é), after the goddess who fled to the moon, and their rover is 玉兔 (Yùtù), her jade rabbit. The space station is 天宫 (Tiāngōng, "heavenly palace"), the Mars rover is 祝融 (Zhùróng), the fire god, and the global navigation system is 北斗 (Běidǒu), the Northern Dipper that oriented travelers for three thousand years. Every launch is a small examination in classical mythology, administered by the evening news.