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Definitions of astronomy on the Web:

the branch of physics that studies celestial bodies and the universe as a whole

Astronomy (Greek: ast?????a = ?st??? + ????, astronomia = astron + nomos, literally, "law of the stars") is the science involving the observation and explanation of events occurring beyond the Earth and its atmosphere. ...

The scientific study of the universe, including the solar sytem, stars and galaxies.

Branch of science dedicated to the study of everything in the universe that lies above Earth's atmosphere.

study of celestial bodies, what they are made of and their magnitudes and motions.

The scientific study of the sun, moon and other celestial bodies.

study of the universe and the celestial bodies, gas, and dust within it. Astronomy includes observations and theories about the solar system, the stars, the galaxies, and the general structure of space. Astronomy also includes cosmology.

Intelligence gathering primarily concerned with macroscopic observation of the cosmos; stargazing. Compare Astrology.

The rising of a star above the horizon.

The scientific study of the Universe and what it contains (planets, stars, galaxies, etc), and how these things formed and evolved over time. Not to be confused with astrology, which is a set of beliefs about the influence of heavenly bodies on human affairs. Astrology is not generally accepted to be a science.

These sections can, of course, be properly appreciated by specialists only. On account of the language in which it was written, Add. 7701 may be noted here, containing works on astronomy and the calendar in Persian (Hebrew characters). XIV.

Learn how Galileo's use of the telescope revolutionized astronomy and why today's scientists now use radio telescopes to study distant stars.

The scientific study of the universe and the things in it.

Organizations that conduct research in astronomy, the physical science that addresses matter and energy in the universe using observational techniques such as spectroscopy, photometry, interferometry, radio astronomy and optical astronomy.

Science that deal with the origin, evolution, composition, distance, and motion of all bodies and scattered matter in the universe. It includes astrophysics, which discusses the physical properties and structure of all cosmic matter. Astronomy is the most ancient of the sciences, having existed since the dawn of recorded civilization.

The science pertaining to the stars, planets, and other astronomical objects. Some people erroneously confuse this with astrology which is NOT a science.

The study of the heavenly bodies.