As Theo said in the post a few days ago, GLOBE at Night (GaN) starts tonight and runs on March 3 – 16. There is a second run between March 17 and March 31 if you want to collect more data. The whole idea is to collect data from real sites all around the world in an effort to document light pollution. So you don’t need to fly out to Arizona to get your data! Your own yard is perfect. All you need is a place to see the constellation Orion about one hour after sunset.

I’ll be keeping a running tab during the month based on whatever observations we gather. Make sure you check the directions at the GLOBE at Night web site – http://www.globeatnight.org/index.html. The data should include latitude and longitude of the site, local conditions such as street lights and house lights. Seeing and transparency would also be a good thing to record. I suggest we use the Clear Sky Clock as a reference for the time being.

You can submit your observations directly to the GaN if you wish. However, please share your data with the Chapter so we can compare our results. We’ll have a first look at the data at the next meeting, on March 13th.