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Hi Rene
I just use a plumb bob on a piece of string.
Let gravity do the work.
Gives a nice straight line to follow.
If you don't have one...then just a simple weight
on the end of some solid twine works too.
Then I use another piece of twine to peg out
the shadow along the ground.
If it's on concrete...draw it in.
There's the south line.
Hope it might help.
Paul.
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