HSCI 3013.002 student Kevin Ray used a 3-D printer in the OU Innovation Hub to make a model of the sun’s orb based on the diagram in Georg Puerbach’s Theorica Nova . He discusses this model and shows how it works in the following video:
Kevin Ray’s celestial sphere printed on a 3-D printer.
Orb of the sun from Peurbach’s Theorica nova (Venice, 1488)
Before Newton 
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