Astronomy contributions

Main

Aristotle

384 BCE - 322 BCE
  • Created the concept of a Geocentric Universe
  • Objects in the heavens are perfect spheres
  • Object on Earth naturally want to be at rest

Aristarchus

310 BCE - 230 BCE

First introduce the idea of a heliocentric model

Eratosthenes

276 BCE - 195 BCE

Geographer who predicted the Earth's circumference to be around 5,000 Stadia which is around 3-15 percent error to modern measurements

Hipparchus

190 BCE - 120 BCE
  • Invented trigonometry
  • Made the first star atlas
  • Device a scale based on relative brightness for stars

Ptolemy

90 AD - 168 AD
  • Created a workable set of equations to predict planetary motion to strengthen the argument of a geocentric model
  • Created the idea that planets have mini orbits to explain retrograde motion

Nicolaus Copernicus

1473 - 1543
  • Published "De Devolutionibus Orbium Celestium" on his deathbed
  • Explained retrograde motion
  • Invented the AU unit

Tycho Brahe

1546 - 1601
  • Documented Mars orbit for 20 years.

Galileo Galilei

1564 - 1642
  • Created the Galilean telescope
  • Discovered the moons of Jupiter

Johannes Kepler

1571 - 1630
  • Introduced the idea of orbiting eclipses
  • Created 3 laws of planetary motion

Issac Newton

1642 - 1726
  • 3 law of motion
  • Invented Calculus
  • Discovered Gravity