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120
Hipparchus
Hipparchus compared the observations of the solar eclipse to determine the distance from the Earth to the Moon. He also discovered eqinonex, calculated the length ofa year, made the first known star catolog, and also made a formulation of triganomentry. 190-120 BC -
170
Ptolemy
Ptolemy wrote several writings. His first major historical writing, Almagest, contains reports of astronomical observations that he made over time. 100-170 BC -
320
Aristarchus
Aristarchus found out how to measure the distance and sizes of the sun and the moon. He also concluded that the sun was much bigger than the moon, and that the sun was the center of the universe. 310-230 BC -
322
Aristotle
Aristotle was the first to classify areas of our human knowledge into certain subjects such as, math, biology and ethics. He was also the first to develop logic. 384-322 BC -
Feb 19, 1508
Nicolaus Copernicus
Nicolaus Copernicus came to a theory that the planets revolved around the sun. His model of this was not completely correct, but it did spark ideas for all of the other scientists. 1473-1508 -
Tycho Brahe
Tycho Brahe made a very accurate celestial observatin of his time, and had an idea of how the universe was organized. 1546- 1601 -
Johannes Kepler
Johannes Kepler created three laws. The first law stated that planets move in ellipses with the sun at one focus, the second law states that the radius vector describes equal areas in equal times, the third law states that the squares of the periodic times are to each other as the cubes of the mean distances. 1571-1601 -
Galileo Galilei
Galileo Galilei discovered the law of motion and made improvements on the telescope. 1564-1642 -
Sir Isaac Newton
Sir Isaac Newton made three laws of motion followed by the Universal Law of Gravitation. 1642-1727 -
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Anaxagoras
Anaxagoras had two theories that in the world, everything contains a portion of everything else. His other theory is that his postulation of mind as the iniating and governing principle of the cosmos. 500- 428 BC -
Eratosthenes
Eratosthenes used geometry to discover the circumference of the earth. 276-194 BC
