Exterior view of an early, spherical planetarium

Exterior view of an early, spherical planetarium

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Caption: Planetarium. Exterior view of an early, spherical planetarium. The metal sphere was 5.5 metres in diameter and held fixed seats for 30 people. Within it a set of ball and rod mechanisms (an orrery) revolved to show the movements of the planets in the solar system. Stars could also be displayed on the inside of the sphere by shining a light through pin-holes in a small, hollow sphere made of tin. This small sphere could also be rotated to show the passage of the stars during the night. This planetarium was constructed by Roger Long at Pembroke College in Cambridge, Great Britain, in about 1750; it stood until 1871.

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Keywords: astronomical, astronomy, cambridge, early, equipment, historical, history of, instrument, long, pembroke college, planetarium, roger's planetarium

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