I have a site on my browser, www.mapmaker.com/shadowfacts/sunweb.asp
that shows the terminator throughout the year. It is fascinating to
see how rapidly the shape changes, and I was astonished to see this
evening that it is nearly a straight line, as we approach the equinox.
Of course, a little thought shows that I have should have expected
this, but to see it on a 'flat earth' reminds one of what is happening
to a globe, or the earth itself.
I expect others have more fun with other representations!
Doug
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