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Links
Absolute Astronomy
http://www.absoluteastronomy.comFacts and statistical information about planets, moons, constellations, stars, galaxies, and Messier objects. Read More »
Astronomical Applications Department, U.S. Naval Observatory
http://www.usno.navy.mil/USNO/astronomical-applicationsComputes the position, brightness, and other observable characteristics of celestial bodies, as well as the circumstances of astronomical phenomena. Includes information on calendars and related topics. Read More »