Great World Wide Star Count

  • Steps
  • Constellations
  • Magnitude Charts
  • Lat/Lon
  • Report
  • Results
  • Science

IYA Thank you for your participation in the Great World Wide Star Count! Over 10,000 observations have been submitted during the 2007 and 2008 Star Count campaigns! Full results of the campaigns, including maps, are now available. More than 31,000 citizen scientists from 60 countries around the world have submitted their reports on the quality of their nighttime sky.

Be sure to join us next year for the International Year of Astronomy (IYA) and the third annual Star Count on October 9 - 23, 2009. Star Count will be featured as part of the Dark Skies Awareness Cornerstone Project for IYA 2009!


Can you see light pollution in your sky?? Light Pollution Interactive

Five Simple Steps to Star Count:
1. Determine which constellation to observe
2. Find that constellation at night an hour after sunset (about 7-9pm local time)
3. Match your nighttime sky with one of our magnitude charts
4. Report what you see online
5. View results of this international event

(For complete steps download the Activity Guide)

Determine which constellation you should observe. Click on your location in the map below. world map northern hemisphere constellation southern hemisphere constellation

This international event encourages everyone to go outside, look skywards after dark, count the stars they see in certain constellations, and report what they see online.  This Windows to the Universe Citizen Science Event is designed to encourage learning in astronomy!

  • Download our Activity Guide to participate! Now available in English, Spanish, Portuguese, Dutch, Italian, Romanian and Chinese.
  • Subscribe to our mailing list to receive email updates about this exciting event!
  • Spread the word! Share our flyers with family and friends!
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Site last updated on 6/12/09