Position and radius of the Sun determined by solar eclipses in combination with lunar occultations

Details Position and radius of the Sun determined by solar eclipses in combination with lunar occultations Position and radius of the Sun determined by solar eclipses in combination with lunar occultations

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..819k&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan, vol. 45, no. 6, p. 819-829

Astronomy and Astrophysics

Astronomy

6

Lunar Occultation, Solar Eclipses, Solar Position, Solar Spectra, Sun, Ephemerides, Least Squares Method, Predictions

Scientific paper

The observation data of four total solar eclipses in 1970, 1973, 1980, and 1991 were analyzed by putting all the data together to obtain accurate coordinates and semidiameter of the Sun relative to those of the Moon. With the position and figure of the Moon rectified by lunar occultation data, a constant correction to the coordinates of the Sun tabulated in the current ephemeris is found as follows: delta lambda (Sun) = -0 sec .04 +/- 0 sec .005, delta beta (Sun) = +0 sec .01 +/- 0 sec .008. Also, the following values for the semidiameter of the Sun were obtained: sigma(Sun) 70 = 959 sec .74 +/- 0 sec .008, sigma(Sun) 73 = 959 sec .84 +/- 0 sec .015, sigma(Sun) 80 959 sec .84 +/- 0 sec .012, sigma(Sun) 91 = 959 sec .88 +/- 0 sec .008 (4615 A) respectively for the 1970, 1973, 1980, and 1991 eclipses, giving an obvious evidence for the change in the solar radius.

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