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Use Cases
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Resources
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Pricing
3000 BCE - 1000 BCE
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used as a calendar
409 BCE - 356 BCE
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Model of 27 nested spheres
384 BCE - 322 BCE
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divided the universe into the perfect heavens and the static earth. Uniform circular motion
190 BCE - 120 BC
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Placed Earth away from the center of the perfect spheres
90 ad - 158
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Added epicycles to account for retrograde motion.
1500
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1543
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written by Copernicus. Didn't account for varying speeds of planets or nonperfect circles
1546 - 1601
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made very precise observations. disproved the perfect universe. believed everything orbited the sun which orbited the earth.
1564 - 1642
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invented observational based science. wrote a dialogue of 2 chief world systems. supported the Copernican model.
1571 - 1630
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used brahe's observations. discovered the non-uniform velocities of the elliptical paths of the planets. 1st to accurately predict planetary motions.
1600
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1642 - 1727
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