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Meridian circle, St Petersburg, Russia, 1876.

Meridian circle, St Petersburg, Russia, 1876.
3 4 c m
actual image size: 32cm x 26cm


Photograph of a meridian circle by Repsold at Pulkowa Observatory, St Petersburg. A meridian circle consists of a telescope attached to a large graduated circle. It is mounted so that the telescope revolves as though in transit in a meridian plane. Using this instrument the ascent and decline of a star can be measured in a single observation.

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© Science Museum / Science & Society Picture Library

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