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earth centered solar system, geocentric universe
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heliocentric, sun centered universe, no telescope
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earth sun stationery, built astronomy instruments
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invented by Hans Lippershey
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planets elliptical, studied planet motion, church
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copernican, heavier fall faster, sun centered
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gravity laws, improved telescope, falling apple
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.