- the part of physics that scientific studies celestial systems and universe as a whole
- The science which treats associated with celestial systems, of their particular magnitudes, movements, distances, times of revolution, eclipses, constitution, shape, as well as the sources of their different phenomena.
- A treatise on, or text-book of, the science.
c.1200, from Old French astrenomie, from Latin astronomia, from Greek astronomia, virtually "star arrangement," from astron "celebrity" (see astro-) + nomos "arranging, regulating," about nemein "to deal completely" (see numismatic). Pre-owned prior to when astrology and originally including it.
- (letter.) The research which treats of the celestial systems, of the magnitudes, movements, distances, periods of revolution, eclipses, constitution, health, as well as the causes of their various phenomena.
- (n.) A treatise on, or text-book of, the science.
It was this which made him add to his labours the burden of delivering every year from 1831 to 1848 a course of gratuitous lectures on astronomy for a popular audience.