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The four "liberal arts," arithmetic, music, geometry, and astronomy; -- so called by the schoolmen. See Trivium.

reduce animals or vegetables to a class or classes; to reduce a series of observations in astronomy; to reduce language to rules.

ge considered as a distinct field of investigation or object of study; as, the science of astronomy, of chemistry, or of mind.

That branch of astronomy which treats of the moon. -- Sel`e*no*log"i*cal, a.

Relating to the stars; starry; astral; as, sidereal astronomy.

In ancient astronomy, one of the concentric and eccentric revolving spherical transparent shells in which the stars, sun, planets, and moon were supposed to be set, and by which they were carried, in such a manner as to produce their apparent motions.

rtaining to the heavenly orbs, or to the sphere or spheres in which, according to ancient astronomy and astrology, they were set. Knaves, thieves, and treachers by spherical predominance. Shak. Though the stars were suns, and overburned Their spheric limitations. Mrs. Browning. Spherical angle, Spherical coördinate, Sp…

An instrument for facilitating the practical use of spherics in navigation and astronomy, being constructed of two cardboards containing various circles, and turning upon each other in such a manner that any possible spherical triangle may be readily found, and the measures of the parts read off by inspection.…

Doctrine or knowledge of the stars; star lore; astrology; astronomy. [Obs.] Which in star-read were wont have best insight. Spenser.

rving the stars with attention; contemplation of the stars as connected with astrology or astronomy. Swift.

Of or pertaining to Tycho Brahe, or his system of astronomy.

One of the nine Muses, daughter of Zeus by Mnemosyne, and patron of astronomy.