Originally posted by scottycelt
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If I also recall correctly the reason Kepler and Descartes present scientific arguments as hypothetical was a result of the fall-out from the Galileo affair: presenting something as a hypothesis kept it in the realm of speculative theory and so protected it from dogmatic censure.
Milton refers to Galileo in Book 1 of Paradise Lost, having visited him in Tuscany in the 1630s, in an epic simile describing Satan's shield:
... the broad circumference
Hung on his shoulders like the Moon, whose Orb
Through Optic Glass the Tuscan Artist views
At Ev'ning from the top of Fesole,
Or in Valdarno, to descry new Lands
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