Ancient Astronomers

Eratothenes creates circumference of earth

240 BCE

He created the number for the circumference of Earth in Egypt. This is important because he is the one who measured how big the earth is.

Ptolemy Publishes star catalog

140 BCE

He listed 48 constellations and created the earth centered view of the universe. This is important because his theory stood for more than 1500 years unchallenged.

Nicolaus Copernicus publishes his book

1543

Nicolaus Copernicus publishes De revolutionibus orbium coelestium which is his theory that Earth travels around the Sun, this is important because this is what actually happens in our universe.

Brache observes supernova

1572

Tycho Brache observes a giant supernova that is beyond earths atmosphere. This is important because it was the first reported supernova ever observed by humans

Johannes Kepler publishes New Astronomy

1609

In this work he creates the 3 laws of planetary motion. This is important because his work is still used in how Earth moves.

Issac Newton creates the 3 laws of motion

1666

Newton creates his 3 laws of motion which are still used today. These are important because they are used for everything such as Astrophysics and even NASA uses them.

Einstein publishes his Theory on Relativity

1915

With the help of his Marcel Grossman, Einstein publishes his theory on Relativity. This is important because this helped with the discovery of Astrophycis.