GLOBE at Night Webapp
The GLOBE at Night organisation are endorsing the Earth Hour event on March 26 and would also like you to help them gather data as part of their research into light pollution.
To take part in the research you simply need to check the night sky and see if you can identify the constellation Leo or Crux. To help you find the constellations GLOBE at Night have provided a Google Map to determine your location and present you with several magnitude charts of the night sky.
All you need to do is determine which of the magnitude charts of the sky most resembles what you see and complete a short form.
Via: Read Write Web