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To find true south ( celestial south ) I used the solar noon shadow meridian method gets you really close to SCP ready for your PA
I gave away using my Silva compass with magnetic declination as it changes slightly from week to week , month to month due to the variations in magnetic flux commutating around the earth
Now I have a permanent line marked in my 2 locations ( Sydney and South coast ) via the solar noon shadow meridian method and I’m only a degree or less off when I start my PA
Cheers
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