Fantastic calculations. Something similar was done, but with images and without borders and using 2 circles and 2 rectangles but that was trying to more accurately simulate moon phases. It could be done with shaped but the non centred anchor of rectangles makes that bit more difficult.
Perhaps you could make a nice fusion of the 2 for a shape based moon phase. I tried but just by trial and error and a serial condition on size and shape. It failed to run on watches. This seems much simpler so far.
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