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Proscenium of the English Opera House, Strand, 21 March 1817, with Walker's exhibition of the Eidouranion.

An Eidouranion is a kind of orrery that combined mechanical movement with a method of back projection. Its invention is attributed to Adam Walker who in the 1780s[1] built one measuring 27 feet in diameter. He used it to accompany his lectures on astronomy. It is an ancestor of planetarium projectors.

It is known that Adam Walker held lectures featuring the Eidouranium at the Royal Theatre in London in the 1780s[2] and the London Lyceum.[3]


External links[edit]

Further reading[edit]

  • King, Henry C, and John R. Millburn. Geared to the Stars: The Evolution of Planetariums, Orreries, and Astronomical Clocks. Toronto: University of Toronto Press, 1978. Print. [esp. Ch. 19: The Eidouranion and Other Large Transparent Orreries]