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A revaluation of the important of the climatic variations on the Earth in the last 120,000 years (Quaternary palaeoclimatological data) led us to render evident a special geodynamic moment around 40,000-39,000 years (ka) before present (BP). We have correlated this moment with a severe change of the precessional year duration caused by a modification of the rotational axis position under the influence of a cosmic body. We consider this cosmic event to be the capture of the Moon (by the Earth), former first planet ...