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Eratosthenes was a greek polymath and he tried to accurately measure the circumference of the earth.
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e had a theory the sun was near the center of the universe and the earth spinning on its axis once daily.
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His belief was Heliocentric model of the universe
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He created a gas absorption heat pump and also created a refrigerator called the Einstein.
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Johannes Kepler had three laws
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.