Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...278..659g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 278, no. 2, p. 659-664
Astronomy and Astrophysics
Astrophysics
4
Astrometry, Atmospheric Refraction, Solar Limb, Sun, Distance, Refractivity, Spectroheliographs, Zenith
Scientific paper
The solar disk distorted by atmospheric refraction is used to determine the first derivative of the refraction with respect to the true zenith distance of the center of the Sun's disk at low altitudes and compared with those obtained from Bennett's formula taken from the Almanac for Computers (1991) and from the table of Radau (1889). At low altitude, there was a large scatter in the deviation of the measured derivatives from those obtained from Bennett's formula or from Radau's table, but contrary to Kort (1960), only a small mean deviation was found. An attempt to determine the second derivative of the refraction with respect to the true zenith distance was not successful because of irregular diffraction. The refraction was recomputed after fitting one of the parameters of Bennett's formula so that its first derivative and the measured one should be equal. In this case also, only a small mean deviation of the fitted refractions from those determined by Bennett's formula was obtained.
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