Definition for AS-TRON'O-MY

AS-TRON'O-MY, n. [Gr. αςρον, a star, and νομος, a law, or rule.]

The science which teaches the knowledge of the celestial bodies, their magnitudes, motions, distances, periods of revolution, aspects, eclipses, order, &c. This science depends on observations, made chiefly with instruments, and upon mathematical calculations.

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