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Word Count: 631
Aristarchus was not just a man of astronomy He was also actively involved in mathematics as well as astronomy He used his knowledge in both fields to discover great advances in the astronomy world like the fact that the earth rotates on its own axis and that the sun is in a fixed position and that the earth revolves around it Even though Aristarchus ideas and hypotheses were not approved by the rest of the astronomers and mathematicians in the Greek world they did not persecute him The exact date that Aristarchus died is not sure of but it is guessed that he was born around 310 BC in Greece They think that he died around 230 BC in Greece Not really anything is known about his childhood or his parents But some of his mentors that helped him with his thirst for knowledge are Archimedes and Strato of Lampsacus Strato of Lampsacus was head of Aristotles Lyceum but Aristarchus is thought to have studied with him in Greece and not Athens In 287 BC Strato succeeded Theophrastrus and became head of the Lyceum at Alexandria It is assumed that Aristarchus started studying with him there shortly after with some very smart and influential men Its thought that Aristarchus made his observations of the summer solstice during 281-280 BC according to Ptolemy One of Aristarchus observations was in the correction of Callipus estimate of the length of they year Aristarchus added 11623 of a day to it and in doing that he discovered six astronomical hypotheses and form those six he founded eighteen propositions They were all regarding the measurement of the sizes and distances of various stars and planets relative to the known diameter of the Earth But of all his discoveries and conclusions Aristarchus is most celebrated as the first to propose a sun-centered universe and for trying to determine the sizes and distances of the sun and moon He is
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