People Flashcards

0
Q

Eratosthenes

A

First to guess circumference of the Earth

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1
Q

Aristarchus

A

First to believe heliocentric

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2
Q

Hipparchus

A

Star catalog and measured length of year

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3
Q

Aristotle

A

Believed the Earth is round

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4
Q

Claudius Ptolemy

A

Ptolemaic System accounted for the movements of planets

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5
Q

Galileo Galilei

A

Discovered four moons, planets are circular disks, Venus has phases, Moon was not smooth, and Sunspots

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6
Q

Sir Isaac Newton

A

Universal Gavitation

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7
Q

Johannes Kepler

A

Laws of Planetary Motion:

  1. Planets move in an ellipse
  2. Sun sweeps equal area in equal time
  3. Square the length the orbital period equals its distance to the Sun
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