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Period: 276 BCE to 195 BCE
Eratosthenes
He discovered that the Earth was not flat by using the sun to measure the true sphere shape of the Earth. This is important to people so they know that the earth is actually a sphere and not flat. -
Period: 90 to 168
Claudius Ptolemy
set up a model of the solar system in which the sun, stars, and other planets revolved around Earth. Known as the Ptolemaic system, it remained in place for hundreds of years, though it turned out to be flat wrong.This is important because even though is thinking the solar system ended up being wrong he was still on the right track saying that they all revolve around an object it just wasn't the sun. -
Period: 1473 to 1543
Nicolaus Copernicus
proposed a model of the solar system that involved the Earth revolving around the sun, according to NASA. The model wasn't completely correct, as astronomers of the time struggled with the backwards path Mars sometimes took, but it eventually changed the way many scientists viewed the solar system.This is important to know because now the further scientists now know that our solar system revolves around the sun. -
Period: 1546 to
Tycho Brache
He achieved his goal of measuring to one minute of arc. His aim was to confirm his own picture of the universe, which was that the Earth was at rest, the sun went around the Earth and the planets all went around the sun. This is important because he proved that the planets do go around the sun. -
Period: 1571 to
Johannes Kepler
determined that planets traveled around the sun not in circles, as Copernicus had thought, but in ellipses. In so doing, he calculated three laws involving the motions of planets that astronomers still use in calculations today. This is important because with the help of him they still use his calculations today. -
Period: to
Sir Issac Newton
he calculated three laws describing the motion of forces between objects, known today as Newton's laws. This is important to us because if he didn't create these laws then there wouldn't be any to keep in place for gravity. -
Period: to
Albert Einstein
Einstein suggested that the laws of physics are the same throughout the universe, that the speed of light in a vacuum is constant, and that space and time are linked in an entity known as space-time, which is distorted by gravity. Albert's discovery is important because he told them that the laws of physics are the same throughout the universe.