Astronomical elements (longitude of perihelion, obliquity and eccentricity) supplied by Laskar et al. 2004 by stey of 1ka, from -51Ma to present (la04past) and from present to + 21Ma.
Michel Crucifix, U. catholique de Louvain, Belgium.
J. Laskar et al., A long-term numerical solution for the insolation quantities of the Earth, Astron. Astroph., 428, 261-285 200
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