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Ptolemy was a Roman astronomer and mathematician who studied the sky with the naked eye, he also supported the Geocentric model
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Ptolemy is well known for his maps and calculations for planetary orbit. His system is known as the Ptolemaic system which states that each planet revolves along a circular path. He is also widely known for his stunning maps of Earths longitude and latitude lines. -
Copernicus's book De Revolutionibus Orbium Coelestium is published after he passes away.
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Copernicus's book De Revolutionibus Orbium Celestium or On the revolution of heavenly spheres is published -
Tycho Brahe was a Danish astronomer who spent his entire life studying the night sky. He is known for making very accurate observations of the start and planets in our solar system.
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Tycho Brahe advocated for a Geo-heliocentric model that is now know as the Tychonic system. This model proposed that the Earth and all the other planets orbited around the sun, as opposed to the Heliocentric model which states that all the planets orbit around the sun, with the sun orbiting the Earth. -
Kepler was a German Astrologer who is now known for his discoveries and breakthroughs regarding planetary motion.
Kepler's biggest achievement was the discovery the the planet Mars orbited in an ellipse. His first law says that all planets orbit in an ellipse. -
Galileo invents his own telescope. With it he discovered the moons surrounding Jupiter. -
Giovanni Domenico Cassini was an Italian astronomer, Mathematician and engineer. He made many discoveries like the Cassini division and several Saturnian satellites
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Galileo publishes his book Dialogue Concerning The Two Chief World System. -
Issac Newton was an English mathematician, and astronomer who is know for his famous laws of gravity that have been used by scientists since they were created
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Newton is credited with inventing the first reflecting telescope, which was the strongest of his day. He used mirrors in his telescope to reflect images toward the eyepiece making the focus better -
Cassini discovered many of Saturn's moons between 1671 and 1684. -
Cassini also discovered a gap in the rings of Saturn, this gap is know called the Cassini gap or division. -
Cannon was an American Astronomer. Her work was critical in the development of stellar classification
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Leavitt was an American Astronomer who who an important asset to the Harvard College observatory for her unique ability to calculate and catalog positions of stars. She now has an asteroid and a crater on the moon named after her.
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Einstein was a German born theoretical physicist. While he was not an astronomer, many of his theory's and discovered impact space as we know it
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Hubble was an American astronomer who played a huge role in observational cosmology. Hubble was one of the first people to theorize of galaxies outside of our own. He is also credited for discovering/naming nebulas, which were thought to just be gases.
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While Einstein wasn't an astronomer, his theory of relativity affected space as well. His theory proposes that the faster you travel though space, the slower you travel through time -
Leavitt discovered the correlation between period and luminosity.( The correlation between how long an object takes to orbit or complete a cycle or revolution and the energy that a star radiates per second.) She puplished her findings in 1908 -
Cannon is known for her incredible ability to quickly classify stars. Between 1911-1915 Cannon classified 5,000 stars per month. Her classifications were based on size, and heat! -
Hubble announced his theory that the universe was expanding contrary to the belief that it was not