Section through the planetary sphere according to Ptolemy's model
Deferent (a centrally located circle in a bright ring) with a centre in c[entrum] deferentis raising an epicycle (top). Above the middle of the deferent is an equant, and under the centre of the deferent – the centre of the world occupied by the Earth. G. Peurbach, Theoricae novae planetarum, Nuremberg, c. 1474, f. 6r.
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