Determining Light Pollution of the Global Sky: Get out and observe the night sky during March 22-Â29, 2006
"Globe at Night" at:
http://www.globe.gov/GaN/index.html
The introduction reads:
"Determining Light Pollution of the Global Sky: Get out and observe the
night sky during March 22-Â29, 2006! Students and families are invited to
participate in a worldwide campaign to observe and record the magnitude of
visible stars as a means of measuring light pollution in a given location."