적위 (태양 적위)
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<timefyi-glossary slug="declination"></timefyi-glossary>정의
지구 자전축 기울기로 인해 태양이 천구 적도의 북쪽 또는 남쪽으로 기울어진 각도로, 1년에 걸쳐 약 ±23.5° 사이에서 변합니다. 적위는 낮의 길이와 태양의 고도를 결정합니다.