Im sure this is old news to some. I think it's pretty cool and it actually works.

Topic
late afternoon sunclock
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As an amateur astronomer, I was familiar with this, and it is a very useful thing to know. There are several useful approximations like this for measuring angular distances. I have always heard that the hand with the thumb included is about 15 degrees of the sky, thus about an hour of time, so it seems that this would give on the order of two hours of camp setup time, depending on your latitude, the season, etc.
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