Jan_10 - Planets and Stars and Galaxies (oh my!) Thursday,...

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Planets and Stars and Galaxies (oh my!) Thursday, January 10
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Cosmological Models: Version 1.0: “Superdome” model Version 2.0: Geocentric model Version 3.0: Heliocentric model
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Heliocentric model explains difference between sidereal sidereal day (23 hr, 56 min) and solar solar day (24 hr).
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Heliocentric model explains retrograde motion retrograde motion of planets. 1 → 2 → 3: prograde (forward) 4 4 → 5 → 6: retrograde (backward) 7 → 8 → 9: prograde (forward)
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Heliocentric model implies distance from Sun to stars stars much greater than distance from Sun to Earth Earth . Since Earth orbits Sun, stars show parallax parallax (a shift in apparent position) over the course of half a year.
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Parallax of stars is too small too small to be seen by the naked eye. Implication: distance to stars is several thousand thousand times Earth – Sun distance.
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Radical Radical aspects of Copernicus’ model: Earth is moving. Earth is not central. Space is big – REALLY big. Conservative Conservative aspects: Stars still glued to celestial sphere. Epicycles are still required.
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Jupiter, Saturn) are opaque spheres orbiting the Sun – just like Earth! Earth is a planet:
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This note was uploaded on 07/17/2008 for the course ASTRO 294 taught by Professor Ryden during the Winter '08 term at Ohio State.

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Jan_10 - Planets and Stars and Galaxies (oh my!) Thursday,...

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