This excerpt is presented as reproduced by Copernicus in the preface to De Revolutionibus 'Some think that the earth remains at rest. But Philolaus the Pythagorean believes that, like the sun and moon, it revolves around the fire in an oblique circle. Heraclides of Pontus and Ecphantus the Pythagorean make the earth move, not in a progressive motion, but like a wheel in rotation from west to east around its own center.' (Plutarch)

This excerpt is presented as reproduced by Copernicus in the preface to De Revolutionibus 'Some think that the earth remains at rest. But Philolaus the Pythagorean believes that, like the sun and moon, it revolves around the fire in an oblique circle. Heraclides of Pontus and Ecphantus the Pythagorean make the earth move, not in a progressive motion, but like a wheel in rotation from west to east around its own center.'

Plutarch

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center circle earth east excerpt fire moon motion move oblique preface progressive pythagorean rest rotation sun think west wheel remains copernicus pontus

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