Dynamical equinox and analytical theory of the sun

Details Dynamical equinox and analytical theory of the sun Dynamical equinox and analytical theory of the sun

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982cemec..26..171k&link_type=abstract

(Conference on Analytical Methods and Ephemerides: Theory and Observations of the Moon and Planets, Namur, Belgium, July 28-31,

Astronomy and Astrophysics

Astronomy

1

Astronomical Coordinates, Equinoxes, Solar System, Celestial Reference Systems, Secular Variations, Terrestrial Planets

Scientific paper

The concept of the dynamical equinox and its relation to the analytical theory of the sun are discussed. The relationship between the FK4 equinox and the dynamic equinox is determined by comparing two analytical theories of the sun - Newcomb's theory and the AT-1 theory developed at the Institute of Theoretical Astronomy - with solar meridian observations made at the United States Naval Observatory (1911-1971). Corrections Delta alpha to the FK4 right ascensions, Delta deltazero to declinations, and Delta epsilon to the angle between the equator and ecliptic are obtained and compared for the two analytical theories. Secular variations in Delta alpha and Delta epsilon are found to be negligible.

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