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Definition of: astronomy

(ə·stron′ə·mē) noun
1. The science that treats of the heavenly bodies, their motions, magnitudes, distances, and physical constitution.
2. A treatise on this science. [<OF astronomie <L astronomia <Gk. astronomia <astron star + nomos law <nemein distribute, arrange]

Most often used phrases:

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Statistical data

"astronomy" has the frequency of use of 0.0002% on city-data.com forum

"astronomy" has the frequency of use of 0.0012% on en.wikipedia.org.