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orrery gears

By Ryan H. Doan-Nguyen
The gears at the center of the Grand Orrery. The hand-cranked orrery once vividly demonstrated the orbital paths of the first six known planets orbiting the Sun; today, the crank on the orrery no longer functions.
The gears at the center of the Grand Orrery. The hand-cranked orrery once vividly demonstrated the orbital paths of the first six known planets orbiting the Sun; today, the crank on the orrery no longer functions.

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Reviving the Wonders of the Solar System: The Restoration of Harvard's 236-Year-Old Grand Orrery