NATS 1745 Lecture Notes - Lecture 3: Star Catalogue, Toothpick, Almagest

• School: York University
• Department: Natural Science
• Course: NATS 1745
• Professor: Robin Metcalfe

Document Summary

Set the earth afloat in air: developed the 1st moving model of the universe, in which the motion of the celestial bodies is explained by placing them on spinning wheels around the. Ships gradually disappear on the horizon bottom-first: earths shadow on eclipsed moon is always round, when you travel north or south, the constellations rise and set more rapidly than they would if the earth is flat. Monday, october 15,2012: planatary motion follows the eudoxan model; planets are carried by invisible spherical orbs with ccm (the daily motion of which is driven by a single outer orb) Whatever is moved must be moved by another : the motion of the orbs is supplied by the motionless prime mover (a spiritual, god-like entity residing in the outermost orb) Aristotle taught comets must be atmospheric phenomena because they don"t appear eternal, therefore they cant be celestial bodies.