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Astronomers In History

Published on Nov 18, 2015

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1.

ARISTOTLE

  • Aristotle's system has been the springboard for every major human achievement of the past 1,000 years.
  • He proved that the Earth is spherical.
  • He believed that the Earth was at the center of the universe.
  • Aristotle also believed the Sun, planets, and stars revolved around the Earth.
  • Aristotle knew that if the Earth revolved around the Sun, then we should see the stars shift position.
Photo by marazmova
2.

ARISTARCHUS

  • He put out the idea that the Sun is the center of the universe.
  • He attempted to measure the relative distances between the Earth and the Sun and the Earth and the Moon.
  • His results weren't very accurate.
  • Aristarchus did not have the technology to get accurate results.
  • His theory that the Sun is in the center if the universe was considered crazy to most people.
3.

PTOLEMY

  • He was an ancient Greek astronomer and mathematician.
  • Ptolemy set up a model of the solar system.
  • In this model, he had the Sun, stars, and planets revolving around Earth.
  • This was known as the Ptolemaic system.
  • The Ptolemaic system was in place for hundreds of years, even though it wasn't correct.
Photo by Thomas Hawk
4.

COPERNICUS

  • He stated that the Sun was the center of the universe instead of the Earth.
  • He felt that the Ptolemaic system was artificial.
  • He made revisions to the Ptolemaic system.
  • In his version, he still kept the orbits circular.
  • Many astronomers proved that Copernicus' version was more accurate.
5.

KEPLER

  • He believed in Copernicus' theory.
  • He used the idea of elliptical orbits to describe the motions of the planets.
  • This became known as Kepler's first law.
  • His second law states that a line from the Sun to a planet sweeps out equal areas in equal amounts of time.
  • His third law states that the square of the number of years of a planet's orbital period is equal to the cube of that planet's average distance from the Sun.
6.

GALILEO GALILEI

  • He is "the father of observational astronomy".
  • Made his own telescope and made many discoveries.
  • He saw the craters, mountains, and valleys of the moon, the Milky Way, and so many more.
  • He discovered four moons orbiting around Jupiter and they are named after him, the Galilean Moons.
  • He supported the Copernican model. (The theory that the sun is the center of the universe)

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