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Precesja

Oś obrotu Ziemi zmienia swój kierunek, co oznacza, że biegun północny nie wskazuje zawsze tego samego punktu na niebie, tylko zakreśla okrąg w przeciągu około 26 tysięcy lat. Wraz z pozycją Ziemi na jej orbicie ma to wpływ na dotkliwość pór roku.

Zdjęcia NASA

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