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280 BCE
Aristarchus of Samos
Made the first heliocentric model of the solar system (meaning the earth revolves around the sun) -
130 BCE
Eratosthenes
Measured the sun's rays at the summer solstice at two different places to find the circumference of the earth. -
1543
Nicolaus Copernicus
He published his heliocentric theory of the universe and proposed that Earth rotates on its axis. -
Isaac Newton
Builds first reflective telescope known as the Newtonian telescope. -
Isaac Newton
Published the "principia mathematica".