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Simon if your trying to find true south or north GrampianStars avatar will give you a clue??????????
You can use the shadow from a vertical pole at Solar Noon (not clock noon) to give you a precise reading of true south.
It 's éven more acuarate than using a compass and deviation readings.
But then it depends on what you need it for ---a quick polar align at night I would assume.
Mark
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