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Astronomers

Published on Nov 18, 2015

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1.

FAMOUS ASTRONOMERS

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2.

Aristotle
Thought that if the earth went around the sun then the relative positions of stars would change as earth moves known as parallax 384-322 BCE

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3.

Aristarchus
A Greek astronomer and mathematician had a model of the solar system but was not accepted. He attempted to measure the real active distances to the moon and
sun
310-230 BCE

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4.

Ptolemy
Made a detailed geocentric model that has been used by astronomers for 14 centuries
100-170 CE

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5.

Copernicus
Thought that Ptolemy's model of the solar system was to complicated. He ended up making another model with better observations then Ptolemy's but his was a heliocentric model
1473-1543

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6.

Kepler
Kepler came up with three principles which are known as Keplers laws the first law states that planetary orbits and ellipses with the sun at one focus. Second law states that planets move faster when closer to the sun. Third law relates the distance of a planet to the sun to the time it takes to orbit
1571-1630

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7.

Galileo
Made improvements to today's telescope he observed the moons Io, Europa, Callisto, and Ganymede orbiting Jupiter

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8.

Isaac Newton most people know who Isaac Newton is because go the apple story when it falls and he thought hmmm what makes it fall

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9.

Edwin Hubble
He is known for showing the recessional velocity of a galaxy with its distance from the earth
1889-1953

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10.

Geocentric model
Description of the cosmos where earth is at the orbital center of all celestial bodies

11.

Heliocentric model
Theory that places the sun at the center of the universe and the planets orbit it

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