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Danjon astrolabe

A Dictionary of Astronomy | 1997 | 530 words | Copyright

Danjon astrolabe A prismatic astrolabe with a micrometer, designed in 1938 by the French astronomer A.Danjon. It eliminates the observer's personal equation in measuring the instant at which the direct and reflected images of a star coincide; hence it is also known as an impersonal astrolabe. The main prism is equilateral so that observations are made at a constant zenith distance of 30 °. Danjon astrolabes have been used since the 1950s for measuring time and latitude and in observations for compiling star catalogues.

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