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Period: 276 BCE to 194 BCE
Eratosthenes
Eratosthenes' Lifetime -
240 BCE
Eratosthenes' Discovery
Eratosthenes was the first to make a measurement of the Earth's size. The estimate was accurate and he also created a method of finding prime numbers. -
Period: 100 to 170
Claudius Ptolemy
Claudius Ptolemy's Lifetime -
127
Claudius Ptolemy Star Catalog
Claudius Ptolemy created a star catalog and the first surviving trigonometric function table. He proposed that Earth was at the center of the universe and everything revolved around it. -
Period: Feb 19, 1473 to May 24, 1543
Nicolaus Copernicus
Nicolaus Copernicus' Lifetime -
1532
Copernicus First Manuscript
Nicolaus Copernicus finished his first manuscript saying the other planets orbited the sun instead of the Earth. -
Period: Dec 14, 1546 to
Tycho Brahe
Tycho Brahe's lifetime -
Period: Dec 27, 1571 to
Johannes Kepler
Johannes Kepler's lifetime -
Nov 11, 1572
Tycho Brahe
Tycho Brahe discovered a 'new star' that was further from our moon. -
Kepler's Book
Kepler published a book called Astronomia Nova with two laws that he created; Planets move in ellipses and the Sun is the focus and the radius vector describes the time and area equally. -
Kepler's Third Law
Kepler discovered his third law that stated periodic times are to squares as the mean of distances are to cubes. -
Period: to
Sir Isaac Newton
Sir Isaac Newton's Lifetime -
Sir Isaac Newton's Discovery
Isaac Newton discovered the laws of gravity and motion which are now the basic principles of physics. He also invented calculus. -
Period: to
Albert Einstein
Albert Einstein's Lifetime. -
Einstein's Speed of Light
Albert Einstein created a new concept called Einstein's Special Theory of Relativity, changing physics with its idea of mechanics of objects approaching the speed of light.