| 21. | In 1859 the orrery was donated by the Dutch state to the city of Franeker.
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| 22. | Has anyone ever designed a computer-based orrery that is accurate in every respect?
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| 23. | Jodrell Bank installs a giant orrery, believed to be the world's largest.
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| 24. | Voigt assisted David Rittenhouse with the construction and repair of an orrery for Princeton University.
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| 25. | Some planetariums have taken advantage of this to use orreries to simulate planets and their moons.
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| 26. | British orrery maker John Gleave represented the Egyptian calendar in a reconstruction of the Antikythera mechanism.
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| 27. | On 30 June 1818 King William I of the Netherlands and Prince Frederik visited the orrery.
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| 28. | The Human Orrery, launched in 2004, is located close to the main Observatory building.
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| 29. | :: Why not make a working orrery to display in the page by that name?
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| 30. | It comprises an astronomical clock and an orrery displaying all the planets known at that time.
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