Links to interesting and useful sites   Listen for meteor radio reflections The Air Force Space Surveillance Radar transmits a 216.98 MHz signal into the heavens 24 hours a day, 7 days a week. Meteors, satellites and spacecraft passing overhead reflect those signals back down to Earth. The radar's primary antenna is located near Lake Kickapoo, Texas.   Angular Separation calculator If coordinates for two objects are entered this spreadsheet will calculate the angular separation between them.   A comparison of astronomical sizes Just how tiny is the Earth?   Space Weather.com A superb site for keeping you up to date with what is happening   Society for Popular Astronomy forum   Mostly British members   Met Office Weather map Useful for seeing if clear skies are on the way!   Astronomy Picture of the Day Stunning images of celestial objects   Nasa Space Station Tracking Predictions of passes of the International Space Station   Heavens Above Satellite, Asteroid, Planet predictions   Digitized Sky Survey   Photographs of the whole sky. Something to compare your images with.