Astronomers In History

Astronomers

• Aristotle
• Aristarchus
• Ptolemy
• Copernicus
• Kepler and Galileo galilei

Aristotle

• He was a Greek philosopher
• he believed earth was the center of all things.
• He placed the moon,sun,planet and stars on a series of circles around earth.
• he came up with parallax
• parallax can be seen with a naked eye

Aristarchus

• He was a Greek astronomer and mathematician
• He made a heliocentric model of the solar system
• He wanted to measure the distance from the moon and the sun
• His discovery is useful in solving a scientific problem

Ptolemy

• he was an astronomer and geographer and mathematician
• he lived in Alexandria Egypt
• he made a book Almagest
• he believed every planet spun around earth
• he created a geocentric model,it was used foe 14 centuries

Copernicus

• he was a polish astronomer
• he believed Ptolemy model was wrong
• he used a wheels on wheels system
• his design was seen as the first real model
• he put the sun in the middle of everything

Kepler

• he was a German mathematician and astronomer
• Kepler found the ellipses best fit
• he founded the Kepler laws
• planets move faster in their orbits closer to sun
• He also related the distance between the planet and son

Galileo

• he was a scientist
• He made improvements to the telescope
• He would view celestial objects
• the moons are known as the Galilean satellites
• he observed that Venus had similar phases as earths moon

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