It might well work with astronomical gear, Phil, but is sure as heck doesn't work with painting. We (my wife and I) recently had installed a new set of back stairs. For the first coat of paint I prayed for dry weather - which dutifully arrived. Then, because I'm a lazy so-and-so, I prayed for rain so as defer the inevitable. It didn't happen.
Coat number four is partially applied and I'm looking out at the clouds as I type. Reprieve! It's not raining, but it sure as heck is threatening.
I do know, though, why this happened. Yesterday afternoon was looking reasonably clear and so I dragged out the dusty Dob in preparation for an hour or two's viewing. You guessed it: the sky clouded over.
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