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containing sphere, and there was no reason
why it should incline one way rather than
another. Empedocles attributed its state
of rest to centrifugal force by the rapid cir-
cular movement of the heavens, as water
is stationary in a pail when whirled round
by a string. Democritus further supposed
that the inclination of the flat earth to the
ecliptic was due to the greater weight of the
89
