-
240 BCE
Eratosthenes (276 BC- 194 BC)
He calculates the Earth's circumference. -
140
Ptolemy (85 CE- 165 CE)
Ptolemy proposed his refined geocentric model. -
1532
Copernicus (1473-1543)
Copernicus finished the first manuscript of his book in which he established that the planets orbited the sun. -
Tycho Brahe (1546-1601)
Published the Tychonic system, scheme for the structure of the solar system. Essentially a diagram where it shows that the Sun was the center. -
Galileo (1564-1642)
Improved the telescope. -
Johannes Kepler (1571-1630)
Kepler published Astronomia Nova, which talked about his discoveries, which are now called Kepler's two laws of planetary motion. -
Francis Bacon (1561-1626)
Discovered the Baconian method, also known as the scientific method. -
Rene Descartes (1596-1650)
Discovered analytic geometry. Descartes also introduced the Cartesian Doubt, along with the idea of skepticism. -
Newton (1643-1727)
Published the theory of gravity. -
John Locke (1632-1704)
Wrote his Second Treatise of Government at the time of England's Glorious Revolution, which overthrew the rule of James II. -
Dmitri Mendeleev (1834-1907)
Published the Periodic Table. -
Marie Curie (1867-1934)
The Curies discover the existence of the elements radium and polonium. -
Leavitt (1868-1921)
Discovered about 2,400 variable stars. -
Alfred Wegener (1880-1930)
Proposed his theory of continental drift. -
Edwin Hubble (1889-1953)
Discovered that countless galaxies exist beyond our galaxy. -
Harry Hess (1906-1969)
Proposed the seafloor spreading hypothesis.
