-
6000 BCE
Hominids Appear> present day (million of years ago)
-
276 BCE
Eratosthenes
Eratosthenes compared the position of the Sun’s rays in two locations to calculate the spherical size of the Earth with reasonable accuracy -
85 BCE
Ptolemy
**created the geocentric view
*Geocentric=earth was center of the universe -
1473
Copernicus
*discovered the heliocentric theory
*heliocentric model -
1546
Brathe
worked with kepler and copernicus to prove mathematically that planets move in elliptical orbits rather than circles -
1561
Bacon, Francis
Empiricism: Basing your knowledge on what you can prove- experiments -
1564
Galileo
*believed the sun was the center of the universe=Heliocentric model
*used a telescope of his own invention -
1571
Kepler
prove mathematically that planets move in elliptical orbits rather than circles -
Descartes
used geometry and algebra -
Locke
thought we were born knowing nothing. -
Newton
*developed the 3 basics laws of motions and the law of gravitational motion -
Mendeleev
*BUILDING THE PERIODICTABLE OF ELEMENTS -
Curie
*discovered radium and polonium -
Leavitt
*discovers Cepheid variable stars
*established the period-luminosity relationship, astronomers could determine cosmic distances -
Wegner, Alfred
produced evidence that the continents are in motion, but because he could not explain what forces could move them -
Hubble
*found evidence for an expanding universe
* ^ "redshift" -
Hess, Harry
confirmed Wegener’s ideas by using the evidence of seafloor spreading to explain what moved the continents.