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Inventory no. 15386 - Former Display Label

A pair of English ARMILLARY SPHERES
c.1700

Brass and silvered brass. Made by John Rowley. These armillary spheres are constructed so as to demonstrate respectively the planetary theories of Ptolemy and Copernicus. For orientating the instruments there are small compasses fitted under the horizon bands, and the bases are fitted with levelling screws. There are separate graduated arcs for measuring altitudes.

This instrument illustrates the Ptolemaic theory. The orbits of the Sun, the Moon and the planets are mounted on eccentric axes in order to demonstrate their apparent movements. This instrument is signed, "I OHN ROWLEY LONDINI FECIT"; it is undated.

[Orrery Collection, no. 7]
Lent by Christ Church.

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