The obliquity of the ecliptic

Details The obliquity of the ecliptic The obliquity of the ecliptic

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73..129w&link_type=abstract

Astronomy and Astrophysics, vol. 73, no. 1-2, Mar. 1979, p. 129-131.

Astronomy and Astrophysics

Astrophysics

2

Astrometry, Ecliptic, Secular Variations, Solar Orbits, Chronology, Least Squares Method, Long Term Effects, Tables (Data)

Scientific paper

In view of the discrepancy between observed and calculated secular rates of change in the mean apparent obliquity of the ecliptic, a reassessment of observed values of the obliquity of the ecliptic is made. Least-squares adjusted values of the obliquity are derived for a number of epochs (1000 B.C. to A.D. 2000). A simple numerical expression for the obliquity is given which supersedes the standard expression and amply approximates the expected cyclic behavior for a time span of at least 1 million years.

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