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earth in center geocentric astronomer mathmagician
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sun center death bed famous heliocentric
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globe center scientist sun revolved earth
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Was created by Hans Lippershey
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Planetary motion telescope elliptical orbit mars
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Heliocentric thermometer compass planetary motion telescope
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laws of motion principle of gravity
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.