cheonguui jeokdo
celestial equator
équateur céleste
천구의 적도는 하늘을 동서로 나누는 가상의 선입니다.
cheonguui jeokdoneun haneul-eul dongseoro nanuneun gajang-ui seonimnida.
The celestial equator is an imaginary line that divides the sky into eastern and western halves.
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