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120
Hipparchus
known for his star catalog, discovered over 850 stars, and separated them based on brightness -
Period: 120 to
Astronomy
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141
Ptolemy ad
created a model of the universe that accounted for the motion of planets -
230
Aristarchus bc
the first to say that the sun was the center of our universe. -
322
aristotle bc
concluded that earth is spherical because it always casts a spherical shadow -
Apr 15, 1543
Nicolaus Copernicus
video comparing the two typesbelieved earth was a planet like the other 5 known planets and helped discover that planets orbited in an elliptical motion Geocentric actually means earth centered. This model is also called the Ptolemaic system in honor of the Greek scientist and philosopher Claudius Ptolemy The heliocentric model, which means sun centered, gradually replaced the geocentric model. -
Tycho Brahe
spent his life trying to disprove Copernicus, and observing heavenly bodies like mars -
johannes Kepler
keplers laws the one who proved without a doubt that plents moved in an elliptical form, with the help of tycho’s notes. Also developed three lawsKeplers Laws- 1 the planets travel in a ellipse 2. Each planet revolves so that an imaginary line connects them all 3. The orbital periods of the planets and their distances to the sun are proportional. -
Galileo Galilei
1564 accurately described the behavior of moving objects, helped perfect the telescope. Created one with 30x magnification -
Sir Isaac Newton
explained gravity as the force that holds planets in orbit around the sun -
Anaxagoras BC
the first philosopher to bring philosophy from Ionia to Athens. He attempted to give a scientific account of eclipses, meteors, rainbows, and the sun 428 -
Eratosthenes bc
the first person to accurately measure the earths circumference
