Astronomy
Published on Nov 22, 2015
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PRESENTATION OUTLINE
Aristotle
believed in a geocentric Universe and that the planets and stars were perfect spheres though Earth itself was not. He also thought that the movements of the planets and stars must be circular since they were perfect and if the motions were circular, then they could go on forever.
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Aristotle's contribution to astronomy was his ability to ask certain questions about the universe which served to stimulate others who came after him to find answers.
Aristarchus
Aristarchus figured out how to measure the distances to and sizes of the Sun and the Moon. Because he deduced that the Sun was so much bigger than the moon, he concluded that the Earth must therefore revolve around the Sun.
Aristarchus was the first to put forward the idea that the Sun was actually in the center of the universe. His theory was considered far too radical.
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PTOLEMY
He propounded the geocentric theory that prevailed for 1400 years.
Ptolemy was the most influential of Greek astronomers and geographers of his time
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COPERNICUS
Nicolaus Copernicus was a Renaissance mathematician and astronomer who formulated a heliocentric model of the universe which placed the Sun, rather than the Earth, at the center
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He was the first person to view the solar system as a heliocentric system instead of a geocentric system.
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GALILEO GALILEI
His investigation of the laws of motion and improvements on the telescope helped further the understanding of the world and universe around him.
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He invented an improved telescope that let him observe and describe the moons of Jupiter, the rings of Saturn, the phases of Venus, sunspots and the rugged lunar surface.
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THE END
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