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The geocentric coordinate system consisting of right ascension (or hour
angle; the angle between an object's longitude and the First Point in Aries measured eastward along the
celestial equator) and declination (the angle above or below the celestial equator, from
 to -90°).
 Altitude, Altitude-Azimuth Coordinates, Azimuth, Declination, Galactic Coordinates, Geocentric Coordinates, Hour Angle, Right Ascension
Duffett-Smith, P. "Equatorial Coordinate," "Equatorial to Horizon Coordinate Conversion,"
"Horizon to Equatorial Coordinate Conversion," "Ecliptic to Equatorial Coordinate Conversion,"
"Equatorial to Ecliptic Coordinate Conversion," "Equatorial to Galactic Coordinate Conversion,"
"Galactic to Equatorial Coordinate Conversion."
§18, 25, 26, 27, 28, 29, and 30 in Practical Astronomy with Your Calculator, 3rd ed.
Cambridge, England: Cambridge University Press, pp. 27-29, 36-37, 38-39, 40-41, 42, 43, and 44, 1992.
© 1996-2007 Eric W. Weisstein
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