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| | brH8Em Yet, much is unclear. Could you describe in more details!... | | brH8Em Yet, much is unclear. Could you describe in more details!... |
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| - | =Development of Models of the Universe=
| + | 4bjXCj Very neat article post.Thanks Again. Really Great. |
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| - | *Aristotle (384 BC - 322BC)
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| - | **Geocentric model (Earth at center)
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| - | **Sun, Moon and planets circle it on concentric spheres which are turning all the time at slightly different speeds
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| - | **All stars fixed on the outer sphere
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| - | http://www.astro.umass.edu/~myun/teaching/a100/images/geocentric.jpg
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| - | *Ptolemy (85 AD - 165 AD)
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| - | **Adapted Aristotle's model by adding epicycles to explain the retrograde motion of some of the planets
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| - | **He called the big concentric spheres "deferents":
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| - | http://csep10.phys.utk.edu/astr161/lect/retrograde/epicycle.gif
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| - | http://www.lasalle.edu/~smithsc/Astronomy/images/epicycle-move.gif
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| - | **[http://www.youtube.com/watch?v=FHSWVLwbbNw here] is an animation of the Ptolmeic universe
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| - | *Aristarchus (2nd century BC) and Copernicus (1473 - 1543)
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| - | **Aristarchus first proposed heliocentric model (sun centered), which is now more associated with Copernicus
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| - | **Earth orbits the Sun
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| - | **Orbits (spheres) are still circular
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| - | **Stars are still fixed in the outer sphere
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| - | **Model explains:
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| - | ***the retrograde motion of the planets (because Earth is moving around the Sun as well as other planets, and they are moving at different speeds; different angles of vision)
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| - | http://www.lasalle.edu/~smithsc/Astronomy/images/copernican-move.gif
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| - | ***Why Mercury and Venus always appear closer to the Sun
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| - | **Copernicus added epicycles to the model to explain the slight variation between the planets' real motion and that of the model
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| - | **Model was in conflict with the religious teachings of the Church
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| - | **Ideas were not widely accepted until Galileo in the17th century
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| - | **[http://www.youtube.com/watch?v=VyQ8Tb85HrU here]is an animation of the Ptolmeic (geocentric) and Copernican (Heliocentric) universes.
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| - | Check out this crazyass astronomical device that was once built for the King of England:
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| - | http://abyss.uoregon.edu/~js/images/planetaria.gif
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brH8Em Yet, much is unclear. Could you describe in more details!...
4bjXCj Very neat article post.Thanks Again. Really Great.
