[sac-forum] Sky clock

I am sure that someone has told me the reason why the sky is so good after a star party. As this year comes to a close I seem to recall that Sunday night is always better than Saturday night. And the next scheduled star party will tend to show clouds moving in around Friday afternoon. Is there a rule of nature or a mathematical formula to explain this? See for you self. 

http://www.saguaroastro.org/content/clocks.htm

Why can't we have this on the weekends?

Just getting cranky with old age.

Andrew

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