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earth centered rome geocentrism outdated historic
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theory sun centered solar system heliocentrism
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medicine jupiter's four moons different weights
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sextant astronomer different thoughts inventor stars
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earth revolved around sun elliptical orbit
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three newton laws telescope gravity refraction
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.