Ancient Astronomers

Eratosthemes (Born 276 BC, Died 194 BC)

255 BCE

Discovered that Earth has a tilt.
Important because this would help scientists with orbit, and to create real replicas and models of the Earth.
Discovered in 255 BC

Claudius Ptolemy (Born 100 CE, Died 170)

85 BCE

Discovered that the Earth is at the Center of the universe.
Important because this would create other ideas following, and making scientists ask what other planets are there outside of Earth, and if there was any other universes like ours.
Discovered: 85-165 CE

Nicolaus Copernicus( Born 1473, Died 1543)

1543

Discovered the Sun's orbit
Important because this would prompt scientists to research the sun and it's core, along with it's heat.
Discovered 1543

Tycho Brahe(Born 1546, Died 1601)

1590

Discovered a New star.
Important, because the discovery would help find out more about stars and how they work, and their age.
Discovered: 1590

Johannes Kelper( Born 1571, Died 1630)

1609

Discovered, that Mars's orbit is an eclipse.
Prompts more information outside just the sun and earth.
Discovered 1609

Isaac Newton (Born 1643, Died 1727)

1665

Discovered Gravity
Helps discover more about our atmosphere and if other planets have gravity, and makes the scientists ask how our planets are being held up in space.
Discovered: 1665

Albert Einstein( Born 1879, Died 1955)

1905

Discovered Photo Electricity
This could help take pictures in planets, so that we could learn what they look like and how big they are.
Discovered: 1905