Abstract
view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS PROBLEMS IN ASTROMETRY: Sur les perfectionnements a apporter aux instruments meridiens et aux observations de position Danjon, Andre Abstract . An experimental transit instrument was designed by the author in 1933. Its principal element is a reflecting prism. The discussion of observations made in Strasbourg until 1939 and in Paris in 1947-1950 has proved the merits of the design. The instrumental part of the mean error of a transit is found to be between 7 and 8 milliseconds. A new instru- ment of the same design with larger aperture has been built for the Paris Observatory and is being put into operation. It appears desirable that declinations be determined without the use of a graduated circle. For a limited range of de- clinations the transit instrument with reflecting prism may be adapted to observation of transits in the prime vertical. Reference is made to an impersonal astrolabe with prism designed by the author that would permit the observation of declinations over a wider range. Publication: The Astronomical Journal Pub Date: March 1954 DOI: 10.1086/106955 Bibcode: 1954AJ.....59...67D full text sources ADS |
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