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east and the other always going west, in such a way that both
went equal distances, they would rightly
meet at the exactly opposite place from where they
started, and then they would both return to the place
they had first left. That is because each of
them would have made a circle around the earth,
above and below, just as though they were on a
wheel that was motionless on the ground.
Similarly, they would go around the earth like
those do who were drawn right through the center
of the earth. For the earth pulls all weight towards it,
and the heavier something is, the more strongly it is
pulled toward the center. For the deeper one digs into
the earth the heavier he finds it to be.
So that you can better understand what I have told you above,
you will be able to see this clearly looking at
some flies crawling about on
an apple and some men walking on the earth
in the two drawings portrayed on the other page.
Look carefully!