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Last Lecture astro

Last Lecture astro - Last Lecture-Ancient Greek...

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Last Lecture - Ancient Greek Astronomy -Motion of planets in sky -Size/ distance of sun and moon Ancient Greek Model Today Ptolemaic model Ptolemy Galileo/ kepler Eudoxus- homocentric spheres centered on earth Every object lived on its own sphere Aristotle (384-322 BC) Historiacally dominant thinker Catholic church _divine Aristotle 1. earth is at center of the cosmos/ fixed Reasons 1. Feels fixed 2. no wind- earth moves in air 3. everything falls towards the center of earth thus earth is at center No paraflx of stars earth fixed Error: Stars are too far away to detect this Plato- earth is heart of gods/ mythology No paralox in the stars Parallax: if an observer moves then foreground objects appear to move relative to background objects Aristotle divided the cosmos into two pieces a) the sublunary sphere- below the moon b) the superlunary- about and including moon Sublunary- imperfect, chaotic, changing -alchemy made of air/earth/fire/water Superlunary: - perfect and unchanging - made of perfect things - eg duintessence 5 th element Two sets of laws of nature sub. Super lunary -Disastrous intellectual split Aristotels view dominated for 1800 years
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-theologically pleasing
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