Astronomy is the branch of scientific study of the stars, planets, and other natural objects in space. It is the oldest of the physical sciences that recognized the regularity of celestial motions and attempted to keep records. The first practical function of astronomy was to provide a basis for the calendar, the units of month and year. The planetary positions have been in use in the preparation of horoscopes in ((astrology)) since very ancient days of human civilizations of all over the world.
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