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first accurate measurement of earth's circumference
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ptolematic thory
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Nicholas proposed heliocentric theory
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Tycho Brahe first sketches of "Tychonic system"
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improved the heliocentric theory of Nicolaus Copernicus, explaining how the planets' speeds varied
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law of gravitation
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Photoelectrical effect
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.