Galileo Galilei

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Galileo Galilei

• 1564 - 1642

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The Ptolemaic universe from Andrew Borde's The
First Book of the Introduction of Knowledge,
1542.
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Earthly Paradise Nicolas de Lyre Postilles sur
lAncien et le Nouveau Testament
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The Ptolemaic universe (a) with a central Earth
and an epicycle-deferent system for each planet.
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To account for as many observations as possible
(b), the Earth is displaced from a central point
C. This device, known as an eccentric, has a
planet on an epicycle revolving around a central
point on a deferent, which in turn revolves
around C, which in turn revolves around the
Earth. Also, the planet revolves uniformly in
relation to an equant point, rather than in
relation to the Earth. Further complicated
variations of this scheme could include epicycles
on epicycles and eccentrics on eccentrics. -http
//www.hcc.hawaii.edu/pine/Thesis/Fig3.htm
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William Cuningham. "Coelifer Atlas" from The
Cosmographical Glasse. . . . London John Day,
1559.
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Galileo Galilei. Syderevs nuncius. In Opere di
Galileo Galilei. . . Page 2 (Works of Galileo
Galilei), Vol. 2. Bologna 1655.
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Galileo's drawings of the moons of Jupiter of
successive nights