10 Prehistoric Timekeeping Tools Revealed

10. Ancient Observatories

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9. Earth Mounds

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8. Notched Bones

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7. Cave Paintings

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6. Bone Carvings

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5. Lunar Calendars

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4. Stone Circles

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3. Fire Sticks

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2. Water Clocks

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1. Sundials

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10 Ancient Clocks That Defy the Ages

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