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The Purbach Crater, named after Georg von Peuerbach.
It is the southern most crater. Interestingly, the
crater directly above the Purbach crater is named after
Peuerbach's pupil, Regiomontanus.
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An illustration from
Theoricae Novae Planetarum
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Ptolemaic model of the spheres for Venus, Mars, Jupiter, and
Saturn
from
Theoricae novae planetarum, 1454.
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