astronomers

Aristotle (384-322BCE)

-Discovered the solar eclipse
-Said the earth was round

Hipparchus (190-120BCE)

-Measured distance between Earth and moon
-Measured rotation procession or Earth's rotation axis

Ptolemy (87-150)

- created the geocentric theory of the solar system

Copernicus (1473-1543)

-proved the sun was the center of the solar system using math
-in model of planets used elliptical orbits instead of round ones

Brahe (1546-1610)

-accurately cataloged 1000+ stars
-discovered a new star, Cassiopeia

Carl Sagan (1934-1996)

-solved the mysteries of the high temperatures on Venus
-experimented on mariner, viking, voyager, and viking


Galileo (1564-1642)

-verified that Venus goes though moon like phases
-discovered the other side of the moon
-found the four moons of Jupiter
-used tides to prove earth's movement
-discovered sun spots
-updated the telescope

Newton (1643-1727)

-Explained why planets were attracted to the sun
-used calculations to prove the earth's elliptical orbit


Einstein (1879-1955)

-found the equivalent between all matter and energy in the universe (e=mc2)

Hubble (1898-1953)

-devised a classification system for galaxies

Cannon (1863-1941)

-classified 250,000+ stars using the OBAFGKM classification system

Wilson (1936-)

-mapped the visible part of the milky way

S. Chandrasekhar (1910-1995)

-came up with the theory of white dwarfs



Tombaugh (1907-1997)

-discovered Pluto
-discovered a comet, 5 open clusters, a super cluster of galaxies, and a globular cluster

Hawking (1942-)

-proved black holes weren't black
-Unified general relativity theory and quantum theory

Pope Gregory XIII (1502-1585)

-created current calendar consisting of 365 days

Michelson (1852-1931)

-found speed of light

Van Allen (1914-2006)

-Mapped two main radiation belts

Bode (1747-1826)

-numerically proved Titus's law