-
150
Ptolemy
Geocentric theory. Dates from this point forward are after Christ. This particular date is approximate. -
155
Hipparchus
Discovery of procession of equinoxes. Date is an estimation of time sometime before christ existed. -
250
Eratosthenes
First calculation of earth's circumfrence. B.C.E -
270
Aristarchus
First proposition of heliocentric universe and first calculations of distance of sun and moon. Before Christ existed. -
350
Aristotle
Discovers that earth is as phere and universe is infinite. Before Christ existed. -
Jan 1, 1543
Nicolas Copernicus
Sun centered universe. (Heliocentric) -
Johannes Kepler
Three laws of planetary motion. Planets run along elliptical paths. -
Galileo
Construction of first complete telescope. -
Giovanni Cassini
first approximation of our solar systems dimensions. First to observe saturn's moons. -
Christiaan Hugens
Wave theory of light published. -
Issac Newton
Laws of motion and universal gravitation. -
Albert Einstein
General theory of relativity states effects of acceleration and gravity on time in space. -
Big Bang
Explosion of single particle is believed to cause ever expanding universe. Theory is still being refined to this day. -
Stonehenge (BEFORE CHRIST EXISTED)
Rock alignment suggests that it could have been specifically constructed to predict lunar and solar eclipses. Before Christ existed.