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Зоната на въртене на земята е наклонена по отношение на линията, перпендикулярна на равнината на земната орбита, и варира между 22.1 и 24.5 градуса. Текущата стойност на наклона е 23,5 градуса и намалява.

Периодът на цикличния цикъл е около 41 000 години.

Когато наклонът е с по-ниска стойност, сезоните са по-меки и по-сравними помежду си. Ако има по-висока стойност, сезоните са по-екстремни.

Image source: NASA

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