ancient astronomers

By giannaj
  • 230 BCE

    Eratosthenes

    suggested the earth was round
  • 150

    Claudius Ptolemy

    suggested the earth was at the center of the universe
  • 1543

    Nicolaus Copernicus

    discovered the earth rotates on an axis

  • Tycho brahe

    suggested the sun orbited earth, other planets went around the sun

  • Johnanes kepler

    created the three laws of planetary motion;
    (1)the planets 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 square of the times to complete one orbit are proportional to the cubes of the average distances from the sun

  • sir issac newton

    created the newton laws ( the motion of forces)

  • albert einstein

    predicted that the gravitational waves has something to do with beginning of the universe