5.9 Ancient Astronomers Timetoast Timeline

By alexam_3
  • Period: 100 to 170

    Claudius Ptolemy

    Claudius Ptolemy was a astronomer and a mathematician. At that time people including Ptolemy believed that Earth was at the center of the Universe. His big achievement was called Almagesti. He discovered that planets moved in epicycles. Even though none of his work was true, the math work for his predictions and his view of the Universe was accepted for a long time
  • Period: 276 to 195

    Eratosthenes

    Eratosthenes was a mathematician, astronomer and geographer. His achievement was being able to use the Sun to measure the size of the round Earth. This was important because at that time people still believed that the Earth was flat.
  • Period: 1473 to 1543

    Nicolaus Copernicus

    Nicolaus Copernicus's big achievement was the heliocentric system, which stated that the Sun was at the center of our solar system. This was important because it is correct and many people at that time believed that Earth was the center of the universe.
  • Period: 1546 to

    Tycho Brahe

    Tycho Brahe was from a rich Danish noble family. He loved astronomy. Tycho's uncle saved the king on Denmark, the king was so thankful he gave Tycho resources. With those resources he built an observatory. He made different tools/instruments to help see the stars. Tycho was able to measure to one minute arc, which is impressive since the telescope had not been invented. He also confirmed his picture of the universe.
  • Period: 1571 to

    Johannes Kepler

    Kepler's big achievement was his Three Laws of Planetary Motion, which stated...
    1. The planted move in elliptical orbits with the Sun at a focus
    2. In their orbits around the Sun, the planets sweep out equal areas in equal times.
    3. The squares of the times to complete one orbit are proportional to the cube of the average distances from the Sun.
    This was an important discovery because Newton used these laws to establish universal gravitation.
  • Period: to

    Sir Issac Newton

    Newtons achievement was gravity, the laws on motion which we know as Newtons Laws. These laws are important because they are conspired the foundation of classical mechanics.
  • Period: to

    Albert Einstein

    Albert Einstein is one of the most famous scientists. He proposed a new way of looking at the Universe which was ahead of his times. He suggested that the laws of physics are the same throughout the Universe. This is important because his ideas changed the understandings of time, space and gravity.