Stabilization of the Earth's obliquity by the Moon

  title={Stabilization of the Earth's obliquity by the Moon},
  author={Jacques Laskar and Fr{\'e}d{\'e}ric Joutel and Philippe Robutel},
ACCORDING to Milankovitch theory1,2, the ice ages are related to variations of insolation in northern latitudes resulting from changes in the Earth's orbital and orientation parameters (precession, eccentricity and obliquity). Here we investigate the stability of the Earth's orientation for all possible values of the initial obliquity, by integrating the equations of precession of the Earth. We find a large chaotic zone which extends from 60° to 90° in obliquity. In its present state, the Earth… 


ABSTRACTThe Earth’s obliquity is stabilized by the Moon, which facilitates a rapid precession of the Earth’sspin-axis, de-tuning the system away from resonance with orbital modulation. It is however,


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1 2 2 . 2 d J. Adem , A· Bergzr , Ph. Gaspar , P. Pest1aux an J.P. van Ypersele 1 Centro de Ciencias de la Atmosfera, UNAM, 04510 ~exico D.F. Universit~ Catholique de Louvain, Institut d 'Astronomie

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