Part 3

Part 3

Published on 18 May 2023
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Transcript
00:00
GEOCENTRIC MODEL
00:06
Aristarchus of Samos
00:07
He firmly believed and stated that the earth and the planets are the one that revolves around the sun but due to lack of evidence and proof, he cannot prove his  belief.
00:16
For nearly 1000 years, Aristotle's astronomic view that the earth was the center of the universe dominated natural philosophy.
00:25
CLAUDIUS PTOLEMY
00:27
- He was born   in Egypt in 100AD - Mathematician,   Astronomer and   a Geographer.
00:33
- He studied the work of all astronomers who had lived before him — particularly the Babylonian and Greek Astronomers.
00:40
- He took all of the observations and measurements collected over the previous 800 years and used his excellent mathematical skills to develop his own model of the universe.
00:49
- Died in Alexandria    in 186 AD
00:53
PTOLEMAIC VIEW OF THE UNIVERSE
00:55
- He placed the Earth at the centre of his geocentric model.
00:58
- The moon orbits on a sphere closest to the Earth followed by Mercury, the Venus and then the Sun.
01:04
- Beyond the sun were a further three spheres on which Mars, then Jupiter and then Saturn orbited the Earth
01:10
- The outmost spehere was where all the stars were located in the 48 constellations that Ptolemy described.
01:18
GEOCENTRIC MODEL
01:22
It wasn't until 1543 that Polish Astronomer Nicolaus Copernicus (1473 - 1543) proposed a revised model putting the Sun at the centre, otherwise known as the Heliocentric Model of the Universe.