AAT timeline

Eratosthenes´s Calculations

240 BCE

Eratosthenes´s discovery was important because he measured the Earth´s circumference using 2 points in 240 B.C.

Claudius Ptolemy´s theory

140

Claudius Ptolemy´s discovery was important because he helped with the idea that Earth was in the middle of the universe around 140 AD.

Nicolaus Copernicus (The Heliocentric Theory)

1543

Nicolaus´s discovery was important because he stated that Earth and the other planets turn around the sun in 1543.

Tycho Brahe´s observations

1590

Tycho Brahe´es observations were an important discovery because it helped Kelper discover planets move in circles.

Johannes Kepler (Elliptic Orbits)

1609

Johannes Kelper´s discovery was important because it helped him figure out that planets moved in elliptic orbits in 1609.

Sir Isaac Newton´s Law of Gravitation

1687

This is an important discovery because it proves that gravity affects anything with mass in the universe. It was discovered in 1687.

Albert Einsteins Astronomy discovery (Relativity)

1905

Albert Einstein's discovery of relativity is important because it helped explain the universe´s origin. He worked on it in 1905 - 1915.