"On Saturday, march 27, hundreds of millions of people around the world will switch off their lights for Earth Hour. It's a great way to save energy and see the night sky. No matter where you live, the event begins at 8:30 pm local time." http://spaceweather.com/ joan Need to leave or subscribe to the Sciart-L listserv? Follow the instructions at http://citnews.unl.edu/presentmethods_lana/listserv/index.html