4 stories mention Simplicius on DeadlyCurious.
Eudoxus of Cnidus proposed in the 360s BC that the apparent motions of the planets could be explained by a system of 27 concentric rotating spheres centred on the Earth. Aristotle expanded the model to 55 spheres. The framework substantively defined European cosmology until Tycho Brahe.
Read the story →Hippocrates of Chios was a Greek geometer of the late 5th century BC — not the famous physician of Cos. He was the first European mathematician to compute the exact area of a region bounded by curves, an achievement that opened the path Eudoxus and Archimedes would later complete with the method of exhaustion.
Read the story →When the Emperor Justinian closed the Athenian Academy in 529 AD, the surviving senior pagan philosophers led by Damascius migrated east to the court of the Sasanian Persian king Khusrau I. Khusrau received them with substantial honour, supported their philosophical work for several years, and eventually negotiated their safe return to the Roman Empire in 532.
Read the story →[Eudoxus of Cnidus](/articles/eudoxus-of-cnidus) — Plato's contemporary and the founder of mathematical astronomy — proposed in the 360s BC that the apparent motions of the Sun, Moon, and five known planets could be explained by 27 concentric spheres rotating around the Earth at different rates and on different axes. The model was the best astronomical framework in the world for the next two centuries.
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