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,
OK?).
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
ZS6EZ
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