sphaera

hoc autem sphaerae genus, in quo solis et lunae motus inessent et earum quinque stellarum quae errantes et quasi vagae nominarentur, in illa sphaera solida non potuisse finiri, atque in eo admirandum esse inventum Archimedi, quod excogitasset quem ad modum in dissimillimis motibus inaequabiles et varios cursus servaret una conversio.

‘This kind of sphaera, in which were present the motions of Sun and Moon and those five stars that are called wanderers and as it were straying, could not be fashioned in that solid sphaera, and one had to wonder at the inventiveness of Archimedes in it, that he had figured out how a single revolution could furnish unequal and diverse courses in unlike motions.’