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Thought was in the center; geocentric
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Disproved ptolemy wrong; Heliocentric solar system
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Sun and earth both in center.
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Chief founder of modern astronomy
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Invented and improved the first telescope
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He developed the law of acceleration
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.