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Peter
Just to help you out I jumped onto Stellarium and found the exact solar noon times for the following weekend dates in Adelaide -
Saturday 10th August 12hr 21min 4 sec
Sunday 11th August 12hr 20min 58sec
Saturday 17th August 12hr 19min 49sec
Sunday 18th August 12hr 19min 38sec
So if you set up your dowl or rod half an hour before ( make sure it’s perfectly at 90 deg NSEW then use your mobile phone to get the exact time, mark your line precisely in the centre of the shadow. The more accurate you can mark it the closer you will be to True south
I set up my HEQ5 mount last week on my line and didn’t even have to adjust the Az or Alt bolts my PA was as close as you need it , must have fluked it !!
First time this has ever happened though but my procedure gets you very close
I gave my good Silver compass away to a friend as when I first started a few years ago the compass was giving me different readings each time I used it
Good luck !
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