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Astronomers In History

Published on Nov 26, 2015

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ASTRONOMERS IN HISTORY

BY: HUNTER BROWN

Aristotle
He lived from 384-322 BCE.He was a Greek philosopher and he thought the Earth was the center of all things. He created a model that placed the sun, moon, planets, and stars on a series of circles that surrounded Earth.

Aristarchus
He was a Greek astronomer and mathematician, he lived from 310-230 BCE. His measurements that he attempted measured the relative distances to the moon and the sun.

Ptolemy
He was and astronomer, geographer, and mathematician and he lived from 100-170 CE. His book Almagest was basted on observations of planets from 800 years earlier. In his model, planets moved on small circles that moved on larger circles,his model was used for another 14 centuries by astronomers.

Copernicus
He was a polish astronomer and lived from 1473-1543. His model is similar to Ptolemy's but Copernicus' is more advanced. His model is now gene really seen as the first step in the de elopement of modern models of the solar system.

Kepler
Kepler was a German astronomer and. Mathematician, he lived from 1517-1630. He invented three laws that are now known as Kepler's Laws.
1. Planetary orbits are ellipses with the sun at one focus
2. Planets move faster in their orbits when closer to the sun.
3. Relates the distance of a planet from the sun to the time it takes to go once around its orbit.

Galileo
Galileo was a scientist who lived from 1564-1642. He approached the questions that we now call the scientific method. He also improved the telescope, his observation that he made showed that Earth was not the only planet or object that could orbit.

Isaac Newton
Newton was a English physicist and mathematician, he lived from 1642-1747. He invented three laws called Newton's three laws of mation, we still use them today.
1. An object in motion tends to stay in motion unless stopped by a force.
2. The direction of force is the same as the direction of acceleration.
3. For ever action, their is an equal and opposite reaction.

Edwin Hubble
Hubble was an astronomer and lived from 1889-1953. He discovered that there were planets and galaxies beyond our galaxy. He was able to show people that the universe expanded far beyond the Milky Way.