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Schoepffer's avatar

Tycho's model certainly does not employ the Ptolemaic model whatsoever. In fact he and Longomontanus ridiculed the 'equant' of Ptolemy. Tycho adopted the dual epicycle that Copernicus used but was not his original concept. It is attributed to Arzachel the Spaniard by both Tycho and Longomontanus and I believe Copernicus also attributes it to him.

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