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Skævhed

Jordens rotationsakse hælder i forhold til den vinkelrette linje på planet af jordens bane og svinger denne vinkel mellem 22,1 og 24,5 grader. Den aktuelle værdi af hældningen er 23,5 grader og er faldende.

Perioden for skævhedscyklusen tager omkring 41 tusind år.

Når hældningen har en lavere værdi, er årstiderne mildere og mere ens. Hvis den har en højere værdi, er årstiderne mere ekstreme i forhold til hinanden.

Kilde: NASA

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