Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125..200l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 2, Sept. 1983, p. 200-203. In French.
Astronomy and Astrophysics
Astrophysics
36
Astrolabes, Astrometry, Solar Diameter, Periodic Variations
Scientific paper
Since 1975 sun observations have been regularly made at CERGA Observatory with an astrolabe with the purpose of improving the earth's orbit around the sun. The accuracy of the results that were obtained has led the author to investigate whether this type of observation could contribute to determine the value of the sun's semi-diameter. The principle of the procedure used consists in determining this parameter from the difference between the crossing times of two successive edges by the same almucantar. For all the measurements made between 1975 and 1982 (totalling 842 sun crossings) the author has obtained the following mean value of the semi-diameter reduced to one astronomical unit: 959arcsec.37±0arcsec.02. This value is far lower than the one used by the "American Ephemeris" and by "Connaissance des temps" but must be compared with other results recently obtained by different methods.
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