The effect of various solar ephemerides on equator and equinox solutions from observations of the sun with the reversible transit circle at Cape Observatory from 1907 to 1959

Details The effect of various solar ephemerides on equator and equinox solutions from observations of the sun with the reversible transit circle at Cape Observatory from 1907 to 1959 The effect of various solar ephemerides on equator and equinox solutions from observations of the sun with the reversible transit circle at Cape Observatory from 1907 to 1959

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.177..181y&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 177, no. 1-2, March 1991, p. 181-186.

Astronomy and Astrophysics

Astronomy

4

Equinoxes, Magnetic Equator, Planet Ephemerides, Solar System, Transit Time, Astronomical Catalogs, Least Squares Method, Sky Surveys (Astronomy)

Scientific paper

Results were obtained of the observations of the sun with the Cape Observatory's reversible transit circle for the years between 1907 and 1959. Least squares solutions were determined for equator and equinox corrections and corrections to the earth orbital parameters, including the ephemeris mean longitude of the sun, the mean obliquity of the ecliptic, the mean longitude of perihelium, and the mean eccentricity of the earth's orbit based on Newcomb's, DE102, and DE200 Ephemerides for each of six catalogs of observations made during this period. It was found that the observed equinox corrections to the instrumental catalog systems depended on the choice of ephemeris. Thus, equinox corrections from DE102 were systematically different from the two other ephemerides.

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