So I found this quote the other day:
And I can’t quite work out whether it makes sense. Yes the shadow on the moon is curved. But though that proves the Earth isn’t a flat square or a cube, does it prove the Earth isn’t a flat disc?
If you take a disc and project it’s shadow onto a wall then as you rotate the disc the shape of the shadow will change to an oval. But will the curve projected onto a small area (i.e. the Moon) change so that it’s clearly not from a sphere?