secha undong
precession of the equinoxes
précession des équinoxes
세차 운동은 지구의 자전축이 변화하는 현상입니다.
secha undong-eun jigu-ui jajeonchuk-i byeonhwa-haneun hyeonsang-imnida.
The precession of the equinoxes is a phenomenon where the Earth's axis of rotation changes.
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