Do nghieng truc (Do nghieng)
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<timefyi-glossary slug="axial-tilt"></timefyi-glossary>Định nghĩa
Goc giua truc quay cua Trai dat va duong vuong goc voi mat phang quy dao, hien tai khoang 23,44 do. Do nghieng truc gay ra cac mua va su thay doi do dai cua ngay trong suot nam.