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Astronomy Timeline
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Updated 20 Sep 2018
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Isavelle
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Space Race
By
Isavelle
27 Sep 2018
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Events
Aristarchus (270 B.C.)
Ptolemy (100 A.D.)
Many astronomers built on the work of Aristarchus, a Greek astronomer. Aristarchus was the first person to present the first known model that placed the Sun at the center of the known universe with the Earth revolving around it.
Ptolemy made the most prominent geocentric model which showed that Earth was the center of the universe. Ptolemy's model had each planet on a series of spheres.
Maragha School (1200 A.D.)
The Maragha School was made in 1200 A.D. In 1543, Copernicus paid homage to the Maragha School.
Nicolaus Copernicus (1543)
Copernicus began making his version of the heliocentric model in the 16th century building off of Aristarchus' work and paying homage to the Maragha School. He also summarized his ideas in a short treatise, Commmentariolus.
Johannes Kepler (1609)
Kepler was a German mathematician and astronomer who helped to refine the heliocentric model with his introduction of elliptical orbits. Kepler showed why planets orbited the sun at different speeds at different times.
Galileo Galilei (1613)
Galileo's investigations of the heavens using the telescope allowed him the solve the flaws in the heliocentric model. His notable discoveries were the phases of Venus, the moons of Jupiter, and that perfect spheres do not exist.
Isaac Newton (1687)
In 1687, Isaac Newton was able the show mathematically the motion of all the planets in their orbits. Newton even found out that gravity was the cause to this phenomenon.
Friedrich Bessel (1838)
In 1838, Friedrich Bessel made the first successful parallax measurement for the star 61 Cygni.
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