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Ptolemaic system

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Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint

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A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000

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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

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deferent

astronomy

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influence on Copernicus

In Nicolaus Copernicus: Copernicus’s astronomical work
…circles of larger radius (deferents); and equants. The equant, however, broke with the main assumption of ancient astronomy because it separated the condition of uniform motion from that of constant distance from the centre. A planet viewed from the centre c of its orbit would appear to move sometimes…
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proposal by Ptolemy

In Ptolemaic system
…out equal angles along the deferent in equal times as seen from a point that he called the equant. The centre of the deferent was located midway between the equant and Earth, as can be seen in the figure.
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