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earth centered solar system, geocentric, clever
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founder of modern day science,heliocentric
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tychonic system,built instruments for astronomy
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geocentric, studied planetary motions, elliptical movements
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copernican theory, dropped balls off tower
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laws of gravity, improved telescopes range
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.