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384 BCE
Arisotle
He knew that if the Earth revolved around the sun, then we should see the stars shift position throughout the year. Since he did not have the technology to detect the shift, as we do today, he concluded that the Earth must rest at the center of the universe. He figured out the Earth was spherical. Aristotle believed that the sun and stars were on separate shells that revolve around the Earth. -
190 BCE
Hipparchus
He created the first star catalog. First one to come up with equinoxes. He calculated the distance from the Earth to the moon, using distance and size. -
168
Ptolemy
Wrote Almagest a set of astronomy manuals which catalogues the stars, eclipses the movement of the sun and moon. His model is the geocentric theory and also called the Ptolemaic Model. He relied on Hipparchus’ astronomy work for the star catalog. -
1543
Copernicus
Mathematician and astronomer and identified the concept of the Heliocentric solar system. -
1546
Tycho Brahe
Known for his accurate and comprehensive astronomical instruments and planetary observations. -
1564
Galileo
Italian Scientist considered Godfather of modern astronomy. 4 moons of jupiter -
1570
Hans Lippershey
Was a lens maker from Germany but moved to the Netherlands. Believed to be the first to apply for a patent for the telescope design of 3X magnification. -
1571
Johannes Kepler
Tycho Brahe’s assistant. Discovered that the orbit of the planets are not circular but elliptical -
Cassini
Italian who discovered the division of the rings of Saturn. 4 of Saturn’s moons, and the rotation periods of Mars and Jupiter. -
Isaac Newton
Further developed works of Copernicus and Kepler using math. Invented reflecting telescope 1668 -
William Herschel
He discovered 2 more of Saturn's moons. Believed to have found polar ice on Mars. He also found Uranus and it's moons. -
Percival Lowell
Discovered the planet Pluto and studied the “canalis” on Mars. -
Ejnar Hertzsprung .
He created the HR diagram. He was also a chemist and astronomer. -
Albert einstein
Theory of Relativity and gravitation -
Edwin Hubble
Using the color of the stars, discovered the universe is expanding. -
Karl Jansky
Discovered the radio waves are emanating from space. -
Sputnik
Russia sent the first satellite into space. It caused the US to create NASA -
Yuri Gagarin
First human to orbit the Earth -
John Glenn
1st U.S. Citizen to orbit Earth -
Period: to
Apollo Missions
The Apollo program was designed to land humans on the Moon and bring them safely back to Earth. -
Neil Armstrong
He was the first man to walk on the moon. -
First Space Shuttle Flight
Space Shuttle Columbia was he first reusable space craft. Launch like a rocket and land like a plane -
Mars Pathfinder Expedition
It took a year to get there. It was the first root rover to be on the surface of the Mars -
Cassini orbiter
It orbited until crashing into Saturn. Nasa knew it would happen.
