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the epicycles of Mercury and Venus to be
on a bar passing through the sun, and to be
between the earth and the sun. The centres
of the epicycles of Mars, Jupiter, and Sat-
urn were supposed to be further away than
the sun. Mercury and Venus were supposed
to revolve in their epicycles in their own pe-
riodic times and in the deferent round the
earth in a year. The major planets were
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