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194 BCE
Eratosthenes solves the circumference of the earth
This is the first accurate measurement of our planet -
85
Claudius Ptolemy proposed that earth was at the center of the universe
This allowed for Greek astronomers to make accurate predictions about positions of planets -
1500
Nicolaus Copernicus discovered that the Sun was at the center of our solar system
This allowed astronomers to further understand how our solar system functions -
1572
Tycho Brahe made the astronomical observations that led to Kepler
Without Tycho Brahe Kepler wouldn't have had the information to make the laws about planetary motion. -
Johannes Kepler came up with the three laws of planetary motion
Revolutionizing how we think about planets and letting us infer more about planets than ever before -
Sir Isaac Newton established the Law of Universal Gravitation
This changed the way we thought about our planets and gave us a greater understanding about how the solar system is based around our sun -
Albert Einstein theory of relativity
Completely unprecedented theory that stated that time moves at different speeds depending where you are in space.