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Period: 276 BCE to 194 BCE
Eratosthenes
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240 BCE
Earth's Circumference
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Period: 104 to 1 CE
Claudius Ptolemy
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150
Geocentric system
While his work was inaccurate and distorted, he influenced many other researches -
Period: 1473 to 1543
Nicolaus Copernicus
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1507
Heliocentric Model
He was able to figure out that everything actually orbited the Sun, explaining many of the problems and potholes the Geocentric couldn't -
Period: 1546 to
Tycho Brahe
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Period: 1571 to
Johannes Kepler
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1572
Stars
He cataloged over 1000 stars and proved that they were actual objects moving through space rather than part of Earth's atmosphere -
Planetary Motion
The set of laws that describe planet motion -
Period: to
Sir Isaac Newton
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Gravity
gravity helped explain the motion of the planets and Sun -
Period: to
Albert Einstein
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Light Measurement
Helped figure out how the maximum speed of light affects measurements of time and space