Copernicus - mathematically equivalent to Copernicus' model...

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Copernicus' heliocentric universe However, no parallactic shift was observed in the stars. If there was actually a very small parallactic shift, then the stars would have to be very far away. Copernicus' contemporaries felt that God would not waste that much space! They argued that, therefore, there must be no parallactic shift at all---the Earth is not in motion. Astronomers now know that the stars are indeed very far away and telescopes must be used to detect the small parallactic shifts. Try out the Solar System Models module of the University of Nebraska-Lincoln's Astronomy Education program for checking your understanding of the geocentric vs. heliocentric model explanation of the planet motions (link will appear in a new window). Tycho Brahe's excellent observations Tycho Brahe (lived 1546--1601 C.E.) revived Heroclides' model that had the all of the planets, except the stationary Earth, revolving around the Sun. Because Brahe was not a neoplatonist, he believed that the Sun, Moon, and stars revolved around the Earth. Tycho's model was
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Unformatted text preview: mathematically equivalent to Copernicus' model but did not violate Scripture and common sense. Tycho calculated that if the Earth moved, then the stars are at least 700 times farther away from Saturn than Saturn is from Sun. Since Tycho felt that God would not waste that much space in a harmonious, elegant universe, he believed that the Earth was at the center of the universe. Astronomers now know that the nearest star is over 28,500 times farther away than Saturn is from the Sun! Though Tycho's beliefs of the universe did not have that much of an effect on those who followed him, his exquisite observations came to play a key role in determining the true motion of the planets by Johannes Kepler. Tycho was one of the best observational astronomers who ever lived. Without using a telescope, Tycho was able to measure the positions of the planets to within a few arc minutes---a level of precision and accuracy that was at least ten times better than anyone had obtained before!...
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