General term for stars and other celestial bodies in classical Chinese astronomy. Rare in modern Japanese; mainly encountered in historical texts.
bright timekeeping star (e.g. Sirius)
Specifically refers to bright stars used for calendrical or timekeeping purposes in ancient Chinese astronomy. Sirius is a typical example.
Mercury (in ancient Chinese astronomy)
Historical Chinese astronomical name for the planet Mercury. Not used in modern Japanese astronomy; the standard term is 水星.
Chinese "Room" constellation (28 mansions)
Refers to the 'Room' (房) mansion, one of the 28 lunar mansions in traditional Chinese astronomy. Highly specialized historical term.
In ancient Chinese astronomical texts, 辰星 was used as a broad term for celestial bodies.
Sirius, one of the bright timekeeping stars referred to as 辰星, was also used as a calendar reference in ancient Egypt.
辰星 was one of the names for Mercury in ancient China.
The Room mansion, one of the 28 lunar mansions, is sometimes also called 辰星.