measures the circumference of the earth with surprising accuracy! (40,000km measured, 40,075km was actual)

suggests the Earth revolves around the Sun. He provides first estimation of Earth-Sun distance. (he was rejected)

Wrote a 140 volume encyclopedia summarizing greek astronomy -Described mathematically a geocentric model, that was accepted for 1,000 years - Problem with Retrograde Motion solved by epicycles

Developed Heliocentric model "perfectly circular orbits"

Tycho Brahe (the smart guy)

Built the first observatory and measured the positions of stars and planets to the highest degree of accuracy possible for the time Kepler was his student

Student of Tycho Brahe Used Brahe’s data to develop his Laws of Planetary Motion Solved the problem of epicycles

Keplers planetary laws (simplified)

1. Planets orbit in ellipses with the sun at one focus 2. planet or satellite get faster as it travels closer to the focus of its orbit(sun) 3. the larger the orbit of the planet the longer its year will be

Invented the first telescope (refractive) Discovered things that destroyed the notion of a “perfect” geocentric universe -Sunspots, Lunar, Maria, Phases of Venus, Moons of Jupiter

Developed the Law of Universal Gravitation, a new theory of light, and Calculus, all essential for further discoveries Created first REFLECTIVE telescope

realized the Earth and Moon are round

Thales in 585 BC (greek)

Able to predict the occurrence of eclipses

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Historical Astronomy

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Question	Answer
Eratosthenes	measures the circumference of the earth with surprising accuracy! (40,000km measured, 40,075km was actual)
Aristarchus	suggests the Earth revolves around the Sun. He provides first estimation of Earth-Sun distance. (he was rejected)
Ptolemy	Wrote a 140 volume encyclopedia summarizing greek astronomy -Described mathematically a geocentric model, that was accepted for 1,000 years - Problem with Retrograde Motion solved by epicycles
Copernicus	Developed Heliocentric model "perfectly circular orbits"
Tycho Brahe (the smart guy)	Built the first observatory and measured the positions of stars and planets to the highest degree of accuracy possible for the time Kepler was his student
Johannes Kepler	Student of Tycho Brahe Used Brahe’s data to develop his Laws of Planetary Motion Solved the problem of epicycles
Keplers planetary laws (simplified)	1. Planets orbit in ellipses with the sun at one focus 2. planet or satellite get faster as it travels closer to the focus of its orbit(sun) 3. the larger the orbit of the planet the longer its year will be
Galileo Galilei	Invented the first telescope (refractive) Discovered things that destroyed the notion of a “perfect” geocentric universe -Sunspots, Lunar, Maria, Phases of Venus, Moons of Jupiter
Isaac Newton	Developed the Law of Universal Gravitation, a new theory of light, and Calculus, all essential for further discoveries Created first REFLECTIVE telescope
Pythagoras	realized the Earth and Moon are round
Thales in 585 BC (greek)	Able to predict the occurrence of eclipses

Created by: Riri:>

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