Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..225w&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 2, Oct. 1977, p. 225-227.
Astronomy and Astrophysics
Astrophysics
11
Diameters, Size Determination, Sun, Astrometry
Scientific paper
Measurements of the solar semidiameter made between 1836 and 1975 are discussed. The currently adopted irradiation constant of -1.55 arcsec, which is based on a true semidiameter of 959.63 arcsec, is checked by a direct comparison of simultaneous transit observations and photoelectric drift scans. A constant of -0.96 arcsec is obtained, supporting the conclusion that the irradiation correction will not always be as large as 1.55 arcsec. The mean semidiameters at unit distance, as derived from the heliometer/drift-scan and transit observations since 1836, are 959.87 arcsec and 961.32 arcsec, respectively. The transit semidiameter becomes 960.07 arcsec with a correction of -1.25 + or - 0.30 arcsec. By combining all measurements, the mean semidiameter finally becomes 960.00 + or - 0.09 arcsec or 696,265 + or - 65 km.
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