bipolarber
Posts: 2792
Joined: 9/25/2004 Status: offline
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If you will accept the proposition that if I prove that the Earth is not the center of our own solar system, it thus cannont be the center of the universe, then the following: If the Earth were at the center of the solar system, we would notice the other, outer planets moving in perfect, continuous arcs across the sky. But they don't. They move part of the year in "retrograde." The two plannets sunward of us, Venus and Mercury, are also seen going through phases in their lighting from the sun, much the same way that the Earth's moon does. This can only happen if they are in orbits closer to the sun than we are. (The outer planets can only be seen in gibbeous, or full.) Also, their apparent orbital motion reveals that they seem to rise above the horizion, then sink below it again. More proof that they are in inner orbits in relation to Earth. Thus, Earth is somewhere in the middle of it's solar system. QED I could go into variences in the Hubble red shift, which proves that the Earth is not at the center of the observable universe, but I think one such explanation is enough for one day. Hope it helps you with your Astronomy final. (Which you are obviously fishing for answers for.)
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