This isn't square. The height needs to be equal to the width. You have the right idea, though.
author says:
Since I was on the ground and the window was high up, the perspective has flattened the circle slightly. So I guess this isn't a perfect circle because when I square the pixels. it does not come out even. Does this disqualify?
very nice sky capture
A good idea. GL
Howdie stranger!
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