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# Map: Celestial Mechanics (Tatum)

Celestial mechanics is the branch of astronomy that deals with the motions of celestial objects. Historically, celestial mechanics applies principles of physics (classical mechanics) to astronomical objects, such as stars and planets, to produce ephemeris data.

Thumbnail: Earth rotating within a relatively small-radius, geocentric celestial sphere. Depicted here are stars (white), the ecliptic (red), and circles of right ascension and declination (cyan) of the equatorial coordinate system. Image used with permission (CC SA-BY 3.0; Tfr000).