@Coyoacan "Many years ago I was killing time in a library and came across a quote from the 13th century referring to the Earth being a globe. I never found it again and ended up thinking that maybe I had just dreamt it up."
The 13th Century Quote is likely Thomas Aquinas in his work 'Suma Theologica':
“The physicist proves the earth to be round by one means, the astronomer by another: for the latter proves this by means of mathematics, e.g. by the shapes of eclipses, or something of the sort; while the former proves it by means of physics, e.g. by the movement of heavy bodies towards the centre, and so forth.”
Then there's dear old Aristotle of course, in the 4th Century BC, after observing lunar eclipses:
"“Either then the earth is spherical or it is at least naturally spherical. And it is right to call anything that which nature intends it to be, and which belongs to it, rather than which it is by constraint and contrary to nature. The evidence of the senses further corroborates this. How else would eclipses of the moon show segments shaped as we see them? As it is, the shapes which the moon itself each month shows are of every kind—straight, gibbous, and concave—but in eclipses the outline is always curved: and, since it is the interposition of the earth that makes the eclipse, the form of this line will be caused by the form of the earth’s surface, which is therefore spherical."