Learn

Solar Observation

National Solar Observatory (McMath-Pierce Solar Telescope)

Big Bear Solar Observatory

SpaceWeather.com

Helioviewer

NOAA Space Weather Prediction Center

Protect Our Dark Skies

Starry Night Lights - Night sky friendly lighting

What's in the Sky Tonight?

Skymaps.com (printable full-sky star charts)

Sky Watch

The Old Farmer's Almanac Astronomy Page

Heavens Above (Satellite Tracking)

Astronomy Project Links from the W.B. Goodwin Community Center

Learn about Astronomy and Telescopes (Thanks Corey!)

Nice list of astronomy links at surveillance-video.com (Thanks Brittany!)