Astronomy Timeline

By James Brown 008
  • 100

    Ptolemy

    Ptolemy
    Egyptian astronomer, mathematician, and geographer of Greek. his writings represent the achievement of Greco-Roman science, particularly his geocentric (Earth-centred) model of the universe now known as the Ptolemaic system.
  • 100

    Geocentric Model

    Geocentric Model
    Geocentric model was developed by Greek philosophers and was the accepted model of the Solar System for centuries. Geocentric actually means earth centered.
    https://www.youtube.com/watch?v=iiBIFlvu-X0
  • 120

    Hipparchus

    Hipparchus
    Greek mathematician who compiled an early example of trigonometric tables and gave methods for solving spherical triangles. Hipparchus measured the distance from the Earth to the Moon during a solar eclipse that was a total eclipse at Syene and a partial eclipse at Alexandria.
  • 200

    Heliocentric Model

    Heliocentric Model
    Heliocentric model, which means sun centered, gradually replaced the Geocentric model. This new system places the Sun at the center of the Solar System with the Earth and all the other planets orbiting it.
    https://www.youtube.com/watch?v=iiBIFlvu-X0
  • 310

    Aristarchus

    Aristarchus
    Greek philosopher and astronomer. Stated that Earth rotates on its axis and revolves around the Sun.
  • 322

    Aristotle

    Aristotle
    A prodigious researcher and writer. His writings span a wide range of disciplines, from logic, metaphysics and philosophy of mind, through ethics, political theory, aesthetics and rhetoric.
  • 500

    Anaxagoras

    Anaxagoras
    A Greek philosopher of the 5th century, was the first of the Presocratic philosophers to live in Athens. He Propsed the theory of “everything-in-everything,” and claimed that intellect was the motive cause of the cosmos.
  • Mar 24, 1543

    Nicolaus Copernicus

    Nicolaus Copernicus
    Copernicus was a mathematician and astronomer who proposed that the sun was stationary in the center of the universe and the earth revolved around it.

  • Kepler Laws

    Kepler Laws
    1. The Law of Orbits: All planets move in elliptical orbits, with the sun at one focus.
    2. The Law of Areas: A line that connects a planet to the sun sweeps out equal areas in equal times.
    3. The Law of Periods: The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit. https://www.youtube.com/watch?v=WTJa8DXlerc https://www.youtube.com/watch?v=WTJa8DXlerc

  • Tycho Brahe

    Tycho Brahe
    A Danish astronomer who is best known for the astronomical observations which led Kepler to his theories of the Solar system.

  • Johannes Kepler

    Johannes Kepler
    A German mathematician and astronomer who discovered that the Earth and planets travel about the sun in elliptical orbit and gave three fundamental laws of planetary motion.

  • Galileo Galilei

    Galileo Galilei
    Italian astronomer provided a number of scientific insights that laid the foundation for future scientists. Both led him to question the current belief of the time, that all things revolved around the Earth.

  • Sir Isaac Newton

    Sir Isaac Newton
    English natural philosopher. In addition to his invention of the infinitesimal calculus and a new theory of light and color, Newton transformed the structure of physical science with his three laws of motion and the law of universal gravitation.

  • Eratosthenes

    Eratosthenes
    Greek mathematician who is famous for his work on prime numbers. Eratosthenes used geometry to estimate the circumference of the Earth.