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Stellarium is planetarium software that shows exactly what you see when you look up at the stars. It

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Stargazing Network provide free Web page hosting for the Amateur Astronomy Community. Stargazing Network is sponsored by Cetus Technology at www.cetus.net.

You should look here for award-winning, NSTA recommended, interactive Astronomy and Space Science Curriculum. Designed to inspire educators AND students.

Sea and Sky is your one-stop source for all things related to the oceans, seas, and space exploration; features information, games, images, news, and much, much more.

Deepsky Astronomy Software. Star charts, observing log, planning, database, telescope control, imaging, spreadsheet and incredible DVD space images. Control your meade telescope with Deepsky!

Only freeware - for Win 95/98/ME/XP/Vista/Win 7. No shareware. Large selection organized by category.

Sky View Cafe is an interactive Java applet for astronomy, with customized local star charts, ecliptic charts, moon phases, rise, set and transit times, lunar and solar eclipses, moons of Jupiter and Saturn, as astronomical event calendar, an ephemer...

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Sky & Telescope, the Essential Magazine of Astronomy. News, observing tips, how-to advice, and more!