Abstract:The Earth's revolution is modified by changes in inclination of its rotation axis. Despite the fact that the gravity field is central, the Earth's trajectory is not closed and the equinoxes drift. Changes in polar motion and revolution are coupled through the Liouville-Euler equations. Milankovic (1920) argued that the shortest precession period of solstices is 20,700 years: the Summer solstice in one hemisphere takes place alternately every 11 kyr at perihelion and at aphelion. Milanković assumed that the pl… Show more
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