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Eratosthenes was the first person to accurately calculate earth’s size and mass. this shows that we started to progress as humans and we started to gain more knowledge than we had in the past.
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Claudius Ptolemy most famous work was the Almagest. it was an textbook and star catalogue. It helped educate its students how to predict locations of any star or planet. this was important because it began the research and studying of how far earth is from the sun and other planets.
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He was the first modern European scientist to say that Earth and other planets revolve around the sun and not vise versa. this is important because it gave us another theory to believe in and study.
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Johannes Kepler discovered that the Earth and other planets travel around the sun in elliptical orbits. Also, he creates the three Kepler laws that we previously learned about. this was important because it was one step too knowing more about the universe and helped us study and understand it more.
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tycho brahe observed supernovas and helped us believe that the universe was not unchanging. the discovery is important because he helped us learn more about our world and how it works.
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Sir Isaac Newton discovered the universal law of gravitation and his laws of motion. this helped us understand why things fell instead of floating around.
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Albert Einstein is famous for making his theory of relativity. this theory is important because it helped us understand time, space, gravity, and the universe.