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Eratosthenes(276–195 B.C.) used the Sun to measure the distance of Earth and found that it measured 24,660 miles which was 211 miles short of his measurement. This was important because of how it made it important to measure the Solar System and the Earth itself. -
Ptolemy (A.D. 90–168) made a system called the Ptolemy system that shows that all the planets and the Sun revolved around Earth and published the Almagest, stating that the planets moved in epicycles. This was important because even though it was flawed and incorrect, many people believed in this system for many centuries. -
Copernicus (1473–1543) proposed the heliocentric system that put the Sun in the middle of the Solar System and that the planets traveled in circular orbits, and while it wasn’t correct, it did change the way people view the Solar System. -
Tycho Brahe(1546-1601) was a dedicated astronomer who built various instruments that would help measure the stars before the invention of the telescope and observing the night sky to see other bright stars in the Solar System. It was important as there were other stars beyond the universe. -
Kepler (1571-1630) believed that all the planets moved in elliptical orbits and made three laws of how the planets functioned. It has made many astronomers use these calculations to this day. -
Sir Issac Newton (1643–1727) established the three laws that describe the force of motion. These three laws relate to how the force of motion makes the planetary objects what it is. -
One of the most influential scientists, Einstein (1879–1955) was well known for studying many things like the theory of relativity which states how the law of physics are the same. This theory gave the ability for scientists to get an understanding of space.