Over a 20 year period of time, Tycho Brahe made consistent observations which supported the heliocentric theory proposed earlier by Copernicus. These observations were made using only a compass and a sextant.
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Copernicus felt that Ptolemy's theory was incorrect. Sometime between 1507 and 1515, he first circulated the principles of his heliocentric or Sun-centered astronomy.
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In 1632, he published a book that stated, among other things, that the heliocentric theory of Copernicus was correct. Galileo was once again called before the Inquisition and this time was found guilty of heresy.
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The heliocentric view of the world, in which the Sun is at the centre of the universe, is also described as the Copernican system. It represents a step forward from the geocentric view of Ptolemy.
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English example sentences with "heliocentric"