GLOBE at Night, a worldwide effort to measure light pollution in the night sky, starts another observing period tomorrow night (March 13).
Participating in GLOBE at Night couldn’t be simpler. Just find one of three constellations an hour or so after local sunset. (I’ll probably pick Orion, but you could also look for Leo or Crux, depending on your location.) Match what you see of that constellation to the pictures that show how the constellation is affected by varying levels of light pollution. Then report your findings to the GLOBE at Night program. (Be sure to report your location too — that is, your latitude and longitude.)
For people equipped with smartphones and tablets, GLOBE at Night provides apps in English, Spanish, German and Polish. You can also download “teacher activity packets” and “family activity packets” in nine additional languages.
This observing session runs through March 22. The final session will be open April 11-20.