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Period: 100 to 160
Claudius Ptolemy
He believed that the earth was the center of the earth and came up with the geocentric theory. To create the geocentric model he mapped up measurements in the sky to create it. -
Period: 1473 to 1543
Nicolaus Copernicus
Believed and discovered that the sun is the center of the solar system and not the earth. -
Period: 1564 to
Galileo Galilei
Discovered the four massive moons of Jupiter
Discovered the moon had mountain dents
Discovered the sun
And had many more discoveries -
Period: 1571 to
Johannes Kepler
Best known for defining laws of planet motion
Created the three laws of planetary motion -
Period: to
Edmund Halley
Edmund Halley was an astronomer and was the first person that calculated the orbit of a comet. it was then that the comet was named after him. "Halley's Comet" -
Period: to
William Herschel
He was an astronomer and composer that is the first person to find Uranus and the planet's two moons and came up with the Stellar Evolution theory -
The discovery of the first four asteroids
The first four asteroids " Ceres, Pallas, Juno, Vesta" was discovered by the person named Giuseppe Piazzi. -
Period: to
Urbain Le Verrier
Urbain Le Verrier is the first person to discover the planet Neptune and was astronomer -
Period: to
Clyde Tombaugh
He discovered Pluto which was once the ninth planet of solar system but that had changed recently due to the planet being too small and now is categorized as a dwarf planet. -
Voyagers 1 and 2
Voyager 1 was launched on September 5th 1977 and voyager 2 was supposed to launch 16 days afterward
