5.8 Ancient Astronomers

Eratosthenes

200 BCE

Astronmical discovery - a system of longitude and latitude and made a map of the known world
Year - 200 BC *DATE AND MONTH UNKNOWN
Importance- created something knew for scientist to use when needing to look at maps

Claudius Ptolemy

127

Astronomical discovery - propounded the geocentric theory of the solar system that prevailed for 1400 years.
Year-127
Importance - The Earth was at the centre - The geocentric model of the universe

Nicolaus Copernicus

Jan 1, 1543

Astonimical discovery - he made the discovery that the sun was stationary in the center of the universe and the earth revolved around it.
Year- 1543 DATE IS UNKNOWN
Importance- it better explained the motions of the heavens mathematically.

Tycho Brahe

Nov 11, 1572

Astronimical discovery - discovered a new star in the Cassiopeia formation
Year- 1572
This is important because.. - it was possible for the universe beyond the Sun and planets to change.

Johannes Kepler

Jan 1, 1609

Astronimical discovery -the orbit of Mars was an ellipse.
Year - 1609
Importance- This helped inferred that other bodies in the Solar System, including those farther away from the Sun, also have elliptical orbits
DATE AND MONTH UNKOWN

Sir Isaac Newton

Jul 5, 1686

Astronimical discovery - the laws of gravity and motion
Year- 1686
Importance - explain the relationship between a physical object and the forces acting upon it.

Albert Einstein

Nov 1, 1915

Astronimical discovery - Theory of relativity
Year - 1915
Importance- transformed our way of living at the cosmos
Day in November is unknown