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				Track seasonal cusp moments in universal time, according to the Earth's orbit. Includes lessons on the astronomical mechanics of equinoxes, soltices, and cross quarters.			 
				
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					Contains maps of the universe zooming out from the nearest stars to the entire visible universe.				 
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					SkyandTelescope.com's Free E-newsletters. Weekly Bulletin ... Sky & Telescope, Night Sky, and SkyandTelescope.com are registered trademarks of New ...				 
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					... portal is currently online at http://www.usno.navy.mil and is being populated. ... About AA. Information about the department and its history ...				 
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					Offering original news and educational features about space, science, and space technology.				 
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					Official site for the The International Year of Astronomy 2009 (IYA2009), the global celebration of astronomy and its contributions to society and culture.				 
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					KidsAstronomy.com is a powerful astronomy websited designed to introduce children to the facinating ... KidsAstronomy.com, part of the KidsKnowIt Network, is the ...				 
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					Cosmos4Kids.com! The web site that teaches astronomy and space science fundamentals to everyone! ... CONDITIONS and PRIVACY POLICY for use of Cosmos4Kids.com. ...				 
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					The World's Top Scientists Heard 15 Million Times a Day				 
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					Official site for NASA, the United States space agency, providing current information on its robotic and manned space exploration missions.				 
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