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200,000 BCE
Hominids Appear
Hominids actually appeared around 6 million years ago. Time toast won't allow me to put a date that far back. -
Period: 276 BCE to 194 BCE
Eratosthenes
-Found the circumference of the Earth with surprising accuracy -
Period: 100 to 165
Ptolemy
-Proposed the idea of a geocentric unverse -
Period: Feb 19, 1473 to Mar 24, 1543
Copernicus
-First proposed the Heliocentric view of the universe -
Period: Dec 14, 1546 to
Brahe
-Helped to make the heliocentric view generally accepted -
Period: Jan 22, 1561 to
Bacon
-Empiricism
-Said that you shouldn't believe anything until you can test if for yourself -
Period: Feb 15, 1564 to
Galileo
-Helped to prove the heliocentric view -Studied the phases of venus -
Period: Dec 27, 1571 to
Kepler
-3 Laws of Planetary Motion
-Planets move in ellipses -
Period: to
Descartes
-I think therefore I am -
Period: to
Locke
-Liberalism -
Period: to
Newton
-Discovered gravity
-Established the three laws of motion -
Period: to
Mendeleev
-Created the periodic table of elements -
Period: to
Curie
-Discovered elements polonium and radium -
Period: to
Leavitt
-Figured out how to find the distance and brightness of a Cephid star -
Period: to
Wegener
-Came up with the theory of continental drift -
Period: to
Hubble
-Proved that galaxies exist beyond our own
-He found that the universe is expanding -
Period: to
Hess
-Used sonar to discover the phenomenon seafloor spreading