Historical Contributions of Early Astronomers

Our understanding of the solar system has changed over time. People didn't always know that earth rotates and revolves. Many ancient people believed that earth was the center of the universe...​

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​Changing views of the universe

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Earth is the center.

"Geo" = earth

"centric" = center​

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​Geocentric

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​Aristotle was a Greek astronomer who believed earth was the center of the entire universe. He saw the sun, the stars, and the planets move across the heavens. He hypothesized this meant earth was at the center.

​​Aristotle

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​Ptolemy was an Egyptian astronomer who believed in the earth - centered model. He believed the earth was round and didn't move at all.

​​Ptolemy

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Multiple Choice

Geocentric means...

• Earth- centered

• Heat from Earth

• Sun centered

• Study of Earth

Sun is the center

"helio" = sun​

"centric" = center​

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​Heliocentric

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​Copernicus was a Polish astronomer who challenged the geocentric model. He hypothesized the sun was the center of the solar system and that the planets revolved around it.

​​Copernicus

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​Galileo made improvements to his telescope and changed his idea of the universe. He was able to study the heavens and see evidence that the heliocentric model was correct.

​​Galileo

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Multiple Choice

Heliocentric means...

• sun - centered

• heat from the sun

• study of the sun

• earth - centered

Multiple Choice

Aristotle believed...

• geocentric model

• heliocentric model

Multiple Choice

Copernicus believed...

• geocentric model

• heliocentric model

Multiple Choice

Ptolemy believed...

• geocentric model

• heliocentric model

Multiple Choice

Galileo believed...

• geocentric model

• heliocentric model

Multiple Choice

What technology helped prove the heliocentric model of the universe?

• computer

• telescope

• calculator

• ruler