The wonderful phenomenon named The Belt of Venus occurs at the end of the day, when the earth casts it's shadow on the horizon.
Read about it in Sky & Telescope: http://www.skyandtelescope.com/community/skyblog/stargazing/84903812.html
Also, in Sky & Telescope is another great article about the loss of dark skies and the growth of light pollution. The say it is one of the easiest problems to address on a local level. I wish I could do more without being rude to my neighbours who all (including the Church across the street) leave their lights on all night. What a waste of energy and they all could save money by either putting in motion lights or just turning out those lights.
If you like to participate in recording the brightness of your night sky read Get Ready for "Globe at Night'.
I am up for this!
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