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True north query

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Subject: True north query
From: (Chris R. Burger)
Date: Tue, 7 Jan 1997 09:23:43 +200
Here's another addition, for those in sunny climes:

Drive a stake into the ground.  Observe how the shadow moves through 
the day.  Trace the path of the shadow's tip.  It should form a 
parabola, or similar (I can't remember which conic section it is, 

The point at which the curve comes closest to the stake corresponds 
to local noon, and is due north of the stake.

Foolproof, and an excellent excuse for taking a day off and watching 
the shadow move.

Incidentally, you can obviously also use the tower itself to generate 
the shadow.

Chris R. Burger

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