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(384BC-322BC) Proved Earth was spherical, along with the Sun, Moon and Planets. Believed Earth was attached to an invisible shell and Moon.
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Inclinometer to determine the latitude of a ship by measuring the Sun's noon altitude of a star.
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(190BC-120BC) Discovery of the precession of the equinox. Created one of the first star catalog. Also calculated distance between Sun, Moon, and Earth.
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(100AD-120AD) Earth is at center, under the geocentric model, Sun, Moon, stars, and planets. They all orbit Earth.
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(1473-1543) Heliocentric model, the Sun is to lie in the center, while Earth and other planets revolved around it. Also came up with the scientific method steps.
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(1546-1601) He is known for his observations. Had most comprehensive and accurate space timing.
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(1564-1642) He discovered Sun spots. Proved stars are not fix to invisible shells. Proved everything doesn't revolve around Earth. Also proved other things revolved around other planets.
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(1571-1619) 3X more manification. Associated with the telescope.
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(1571-1630) was a German mathematician motion.
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First developed in 1608. An optical telescope that uses a lens as its objective to form an image.
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(1625-1712) Was a French astronomer discovered the Cassini Division, the dark gap between the rings A and B of Saturn. He also discovered the 4 Saturn's Moons.
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(1643-1727) Recognized as one of the most influential scientists of all time. Also helped develop the infinitesimal calculus.
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Was invented in 1668. A small telescope that is generally considered by professional astronomers to be any reflector-type telescope with a primary mirror of less than 2 meters diameter.
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(1738-1822) Was a British astronomer, the Founder of Sidereal astronomy of the systematic observation of the heavens.
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(1855-1916) Was an American astronomer who predicted the existence of a planet beyond the orbit of Neptune and initiated the search that ended in discovery of Pluto.
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(1873-1967) Was a Danish astronomer who developed the Hertzsprung-Russell diagram.
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(1879-1955) Was a German physicists who made a theory of relativity and gravitation.
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(1889-1953) Was an American Astronomer who discovered colors of the stars and discovered the universe is expanding and his theory was based on the Big Bang Theory.
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(1905-1950) Discovered the radio waves are emanating from space.
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(1921-2016) First man to walk on the moon. Also became the first American to orbit the Earth 3 times.
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(1930-2012) First man to walk on the moon.
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(1954) Was the first artificial Earth satellite and it was launched to low Earth orbit.
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(1956) It was designed as a technology demonstration of a new way to deliver an instrumental lander and the first-ever robotic rover to the surface of the red planet. Also returned on unprecedented amount of data and outlived its primary design.
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(1961) First human (Soviet) to orbit Earth.
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(1963-1975) Get humans on moon and get them back.
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(1981) Was the fourth human spaceflight program carried out by the national aeronautics and the space administration which transported Earth's orbit crew.
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(1997-2017) Was a collaboration between NASA, the European Space Agency and the Italian Space Agency to send a probe to study the planet Saturn and its system, including its rings and natural satellites.
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(2018) Increases the low Earth maximum. Based on Fuselage and engines of the Falcon Heavy design.
