Astronomers timeline

By SharklikesCake
  • 240 BCE

    Eratosthenes

    Eratosthenes made the number theory. His theory is to find all the prime numbers to any given limit. He made this theory in 240 BC. His theory allows us to make it possible to isolate and determine all prime numbers up to a given natural number, which is used today.
  • 150 BCE

    Claudius Ptolemy

    Ptolemy was able to combine what he saw of the stars movements with mathematics, to predict the movements of the planets(it was called the geocentric theory). He made this discovery in 150 BC. HIs math formula helped made accurate predictions of planetary positions and solar and lunar eclipses.
  • 1543

    Nicolaus Copernicus

    Copernicus made the heliocentric theory, which said that the sun is the central point, and the planets orbit around the sun. He made the the theory in 1543AD. This theory was important because it changed peoples perspective of how our Earth's relates to our Sun.
  • 1572

    Tycho Brahe

    Tycho theory, is a model of the universe that hypothesizes that the earth is the center of the universe. He made this theory in 1572. Tycho created detailed mathematical tables that astronomers used for centuries.

  • Johannes Kepler

    One of Kepler theories, is the three laws of planetary motion. The law describes the orbit of planets around the sun, and how long a planet takes to go around the sun. The theory was created in 1609. Kepler law is used to predict the orbit of many objects such as asteroids and comets.

  • Sir Isaac Newton

    Sir Isaac Newton law of gravity states, any particle of matter in the universe attracts any other with a force. He made this theory in 1687. His theory is important today, because gravity is universal and affects all objects in the universe.

  • Albert Einstein

    Albert Einstein made the theory of relativity. It states that the laws of physics are the same for all non-accelerating observers. He also showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels. He made the theory in 1905. His theory is used to explain light bending due to gravity, the behavior of the planet Mercury in its orbit, and the existence of black holes.