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nary central fire called the Antichthon. Coper-
nicus in the sixteenth century claimed Pythago-
ras as the founder of the system which he,
Copernicus, revived.
Anaxagoras (born 499 B.C.) studied as-
tronomy in Egypt. He explained the re-
turn of the sun to the east each morning by
its going under the flat earth in the night.
He held that in a solar eclipse the moon
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