I did not think of using Stellarium to find out the exact time when the sun traverses the meridian, I just used line of sight over head around midday or so , marked my time points at 11.00am and 1.00pm and ran a line through them for true east / west ( Like you mentioned I could be out by quite a margin )
What 2 time marks did you dissect to achieve your true east / west line and hence your true north / south ?
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