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Uploaded on Jul 15, 2007
The Earth's precession of its orbit eccentricity (e) and perihelion longitude (omega) over the last million years, a result of the planets' gravitational pulls on each other. The center + is for the invariable plane. It helps produce the "Milankovitch cycles" of the Earth's sunlight inputs, which are involved in the comings and goings of the Ice-Age continental glaciers. The center + is for a circular orbit. Referred to present (J2000) equinox and ecliptic. Calculated from the quasiperiodic-series approximations in J. Laskar, "Secular evolution of the Solar System over 10 million years", Astronomy and Astrophysics, 198, 341-362 (1988). http://adsabs.harvard.edu/abs/1988A&A...