Astronomy Definition

The science of the universe in which the stars, planets, etc. are studied, including their origins, evolution, composition, motions, relative positions, sizes, etc.
Webster's New World
A system of knowledge or beliefs about celestial phenomena.
The various astronomies of ancient civilizations.
American Heritage
A book or treatise on this.
Webster's New World
The definition of astronomy is the scientific study of matter outside of the atmosphere of the Earth including stars, planets and what they are made of and how they move.
Someone who examines moon rocks to determine their composition is an example of someone who engages in astronomy.

Origin of Astronomy

  • Old French astronomie, from Latin astronomia, from Ancient Greek ἀστρονομία (astronomia), from ἄστρον (astron, “star”), from Proto-Indo-European *h₂stḗr (“star”) + νόμος (nomos, “arranging, regulating”), related to νέμω (nemō, “I deal out”).

    From Wiktionary

  • Middle English astronomie from Old French from Latin astronomia from Greek astronomiā astro- astro- -nomiā -nomy

    From American Heritage Dictionary of the English Language, 5th Edition

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