gǔdài / tiānwénxuéjiā / tōngguò / guāncè / rìyuèwǔxīng / de / yùnxíng / lái / zhìdìng / lìfǎ

古代天文学家通过观测日月五星的运行来制定历法。

Ancient astronomers formulated calendars by observing the movements of the sun, moon, and five planets.