Clear Sky Chart

Days of Astronomical Darkness @ TGCO by Steve Walters author of CCDNavigator

1/20/2012 – 1/23/2012
2/18/2012 – 2/22/2012
3/19/2012 – 3/23/2012
4/17/2012 – 4/22/2012
5/16/2012 – 5/22/2012
6/15/2012 – 6/22/2012
7/16/2012 – 7/22/2012
8/15/2012 – 8/20/2012
9/13/2012 – 9/18/2012
10/13/2012 – 10/17/2012
11/11/2012 – 11/14/2012
12/11/2012 – 12/13/2012
1/9/2013 – 1/12/2013

Download the Vcal file here.  (Right Click and Save Link As)