Ancient Astronomers Timeline

  • 240 BCE

    Eratosthenes (276-194 BC)

    Invented geography, which lead to future developments that created the geography and maps that we know and use today.
  • 140

    Claudius Ptolemy (100-170 AD)

    Claudius Ptolemy (100-170 AD)
    Developed the geocentric theory, which, while not correct, lead to the heliocentric theory, which advanced our knowledge of the solar system.
  • 1500

    Nicolaus Copernicus (1473-1543)

    Nicolaus Copernicus (1473-1543)
    Proposed the heliocentric theory, which advanced our knowledge about astronomy and the solar system, and disproved many people's ideas at the time.
  • 1576

    Tycho Brahe (1546-1601)

    Tycho Brahe (1546-1601)
    Created the observatory Uraniborg, which was the first of its kind, and antedated the invention of the telescope
  • Johannes Kepler (1571-1630)

    Johannes Kepler (1571-1630)
    Created the three laws of planetary motion in 1602, 1605, and 1618. These laws helped people discover what they know today about the solar system.
  • Isaac Newton (1643-1727)

    Isaac Newton (1643-1727)
    Created the three laws of motion, the theory of gravity, invented calculus, and studied optics/developed early forms of the telescope. His inventions/discoveries lead to more powerful methods of solving math problems, and basically paved the way for every scientific breakthrough we've ever made. He discovered/invented most of his ideas throughout the years of 1666 to about 1717.
  • Albert Einstein (1879-1955)

    Albert Einstein (1879-1955)
    Most known for developing the theory of relativity. One of the most famous scientists, known for his influence on the philosophy of science. His work is now one of the two pillars of modern physics. His papers that published his findings were released in 1905, but his research and developments continued throughout his whole life.