Jiù lìfǎ zhōng, qī yào yònglái mìngmíng yìzhōu de rìzi.
In old almanacs the seven luminaries name the days of the week.
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七曜 (the seven luminaries) were the sun, moon and five visible planets in old astronomy. This naming system passed into Japanese, where the weekday names still end in 曜日 (曜日).
