Again, Our Observations Of The Stars Make It Evident, Not Only That The Earth Is Circular, But Also That It Is A Circle Of No Great Size.

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"Again, our observations of the stars make it evident, not only that
the earth is circular, but also that it is a circle of no great size.
For quite a small change of position to south or north causes a manifest
alteration of the horizon. There is much change, I mean, in the stars
which are overhead, and the stars seen are different, as one moves
northward or southward. ...All of which goes to show not only that
the earth is circular in shape, but that it is a sphere of no great
size: for otherwise the effect of so slight a change of place would
not be so quickly apparent. Hence, one should not be too sure of
the incredibility of the view of those who conceive that there is
a continuity between the parts about the pillars of Hercules [the
strait of Gibraltar] and the parts about India, and that in this way
the ocean is one."
-- Aristotle, De Caelo, Fourth Century B.C.

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