Ancient Astronomers

Eratosthenes solves the circumference of the earth

194 BCE

This is the first accurate measurement of our planet

Claudius Ptolemy proposed that earth was at the center of the universe

85

This allowed for Greek astronomers to make accurate predictions about positions of planets

Nicolaus Copernicus discovered that the Sun was at the center of our solar system

1500

This allowed astronomers to further understand how our solar system functions

Tycho Brahe made the astronomical observations that led to Kepler

1572

Without Tycho Brahe Kepler wouldn't have had the information to make the laws about planetary motion.

Johannes Kepler came up with the three laws of planetary motion

1609

Revolutionizing how we think about planets and letting us infer more about planets than ever before

Sir Isaac Newton established the Law of Universal Gravitation

1687

This changed the way we thought about our planets and gave us a greater understanding about how the solar system is based around our sun

Albert Einstein theory of relativity

1905

Completely unprecedented theory that stated that time moves at different speeds depending where you are in space.