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Discovered in 255 BC- measured Earth's circumference mathematically using two surface points to make the calculation.
Important- the circumference of the earth was about 50 times greater than the distance from Alexandria to Aswan. -
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Discovered in March 16, 127- record longitudes and latitudes in degrees for roughly 8,000 locations on his world map Important- astronomers could accurately predict eclipses and the positions of planets. -
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Discovered in 1508 -The theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun. Important-that Earth and other planets revolve around the sun, -
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Discovered in 1572- C/1590 E1
Important: It showed that it was farther away than the Moon and was among the fixed stars, which were regarded as perfect and unchanging. -
Discovered in 1609- that the orbit of Mars was an ellipse
Important- planets move proportionally faster in their orbits when they are closer to the Sun -
Died -
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Discovered in 1665 or 1666 - the gravitational force
Important - proposed that all objects in the Universe pulled on each other through gravity. -
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Discovered in 1915 the theory of relativity Important- he predicted black holes and gravitational waves -
Died