2002 Planetary Phenomena - NASA/GSFC
 12-year Astronomical Ephemeris Data - NASA/GSFC
 Seesat-l - Satellite Observers Listsrv
 Cometography - current/catalog/history/orbits 
 Meteor Calendar - Kronk's CM&S page
 Seattle Astronomical Society 
 ADC - Astronomical Data Center
 ALPO - American Lunar & Planetary Observers
 AAVSO - American Association Of Variable Star Observers
 ALS - American Lunar Society
 IOTA - International Occultation Timing Assoc.
 AMS - American Meteor Society
 SARA- Society of Amateur Radio-Astronomers
 Aurora Monitor Project
 SanFrancisco Sidewalk Astronomers
 NASA/GSFC Eclipse Page
 RASC - Royal Astronomical Society of Canada
 Mike McCants' Satellite Tracking Web Page
 NASA Watch - Watching the Dark Side of NASA
 Live Spy Sat Locator