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Transit instrument, St Petersburg, Rusia, 1876.

Transit instrument, St Petersburg, Rusia, 1876.
3 3 c m
actual image size: 32cm x 25cm


Photograph of a large fixed transit circle by Ertel, taken at the Pulkowa Observatory, St Petersburg, Rusia. The transit circle was used to measure both the right ascension and declination of a star - the celestial equivalent of latitude and longitude.

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