Star Viewer ― merging Google Earth (Sky) with Hubblecast videos to learn more about what you're seeing in the night sky. [more inside]
posted by netbros on Feb 17, 2009 - 4 comments

The "terminator" is the dividing line between day and night as seen from on high. This shadow line is diffuse and shows the gradual transition to darkness we experience as twilight. [more inside]
posted by nickyskye on Sep 16, 2008 - 44 comments

See Saturn this Saturday April 12 is the second annual International Sidewalk Astronomy Night, a worldwide event coordinated by the Sidewalk Astronomers. The group, founded in 1968 by John Dobson (subject of this documentary), is dedicated to a sort of guerrilla astronomy -- experienced stargeeks bringing their really good telescopes out to places where people are. So even on your way to the bars, the shows, and the honky-tonk you can see stuff like this and this - like these people did.
posted by Miko on Apr 10, 2008 - 16 comments

Not content to merely index all things terrestrial, Google Earth now lets you set your sights on the sky.
posted by the painkiller on Aug 22, 2007 - 23 comments

Clear Sky Clocks. How dark is it going to be tonight?
posted by gottabefunky on Aug 27, 2004 - 3 comments

Celestial Atlases are perhaps some of the most beautiful scientific books ever published, capturing the mystery and the grandeur of the heavens, and rife with beautiful and often intimidating interpretations of the constellations. Out Of This World has been my favorite website since the dawning of time, and one I go back to over and over again even though it never changes. The period from 1603 to 1801 produced the most beautiful star maps, and you don't have to know a thing about astronomy to appreciate how heavenly these are.
posted by iconomy on Sep 10, 2002 - 9 comments