History of Aristarchus of Samos

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Information about History of Aristarchus of Samos

Published on February 20, 2009

Author: Studio60

Source: authorstream.com

Slide 1: Aristarchus of Samos Aristarchus t?? S?µ?? Greek Astronomer and Mathematician Slide 2: Dates of Birth & Death Aristarchus or Aristarch, was born around 310 BC – ca. 230 BC. was a Greek astronomer and mathematician, born on the island of Samos, in Greece. Slide 3: Early Life He was the first Greek, and the first man in general, to present an explicit argument for a heliocentric model of the solar system, placing the Sun, not the Earth, at the center of the known universe. He was influenced by the Pythagorean Philolaus of Kroton, but, in contrast to Philolaus, he had both identified the central fire with the Sun, as well as putting other planets in correct order from the Sun. His astronomical ideas were rejected in favor of the geocentric theories of Aristotle and Ptolemy until they were successfully revived nearly 1800 years later by Copernicus and extensively developed and built upon by Johannes Kepler and Isaac Newton. It is so far unknown what Aristarchus early life was like. Aristarchus never attended collage. Slide 4: Country of Origin The culture of Greece has evolved over thousands of years, with its beginnings in the Mycenaean and Minoan Civilizations, continuing most notably into Classical Greece, the Hellenistic Period, through the influence of the Roman Empire and its Greek Eastern successor the Byzantine Empire. The Ottoman Empire too had a significant influence on Greek culture, but the Greek war of independence is credited with revitalizing Greece and giving birth to a single entity of its multi-faceted culture throughout the ages. Slide 5: Contributions Aristarchus also applied modern geometric methods to measuring the size of celestial bodies. From a lunar eclipse, he concluded that the radius of the Moon was 0.5 times the radius of the Earth. He measured the Moon's angular diameter to be 2° and calculated the Earth -Moon distance to be 114.6 Earth radii. By noticing that the Sun and Moon have equal angular diameters during a solar eclipse, he calculated that the distance to the Sun was 19.1 times the distance to the Moon. Although his angular measurements were inaccurate, his geometric procedure was correct.

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