The Heavens

The Dimensions of the Heavens

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Part 2

The Heavens are Eternal

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Part 1

Circular motion

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Part 3

The Heaven is a Sphere

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Part 4

Moving along a circle

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Part 5

The Harmony of Stellar Movement is False

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Part 9

The Relative Movement of the Stars and the Heavens

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Part 8

The Spheres

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Part 10

The Spheres

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Part 12

The Position and Shape of the Earth

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Part 13

The Position and Shape of the Earth

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Part 14

The Vortex Theory of Empedocles (from Anaximander)

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Part 13b