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Useful Formulae Math calculators for backyard astronomers
Astronomy Picture Of The Day Your tax dollars hard at work
Cloudy Nights  Telescope reviews
Night Sky Network  NASA's educational outreach site, with many great events
Red Orbit  General-interest space-science page; excellent astro-photos
Skyhound A great source of timely information for the observer
General-interest space science page
USNO Astronomy Data Online  Great online calculators for a variety of phenomena The role of data Science in Astronomy