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Astronomy 1Definition: Astrology.
Astronomy 2Definition: The science which
treats of the celestial bodies, of their
magnitudes, motions, distances, periods of revolution,
eclipses, constitution, physical condition, and of the
causes of their various phenomena.
Astronomy 3Definition: A treatise on, or
text-book of, the science.
astronomy 4Definition: the branch of physics that studies celestial bodies and the universe as a whole