Tien dong truc
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<timefyi-glossary slug="precession"></timefyi-glossary>Định nghĩa
Su lac cham cua truc quay Trai dat, hoan thanh mot chu ky day du khoang moi 25.772 nam (Nam Platon). Tien dong truc khien diem phan xuan trai qua cac chu du hanh tinh hoang dao trong hang ngan nam.