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Précession

L’axe de rotation de la Terre bascule lentement au cours de milliers d’années, ce qui signifie que le pôle Nord ne pointe pas toujours dans la même direction dans le ciel, mais tourne de manière circulaire en environ 26 000 ans de période. Ce changement lent de l’axe de rotation de la Terre affecte la sévérité des saisons.

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