地軸傾斜（黄道傾斜角）
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<timefyi-glossary slug="axial-tilt"></timefyi-glossary>定義
地球の自転軸と軌道面の垂線との角度で、現在約23.44度。地軸の傾きが季節と年間の昼の長さの変化をもたらす。