晨昏线的六个特点 1平分地球,是过球心的大圆。 2晨昏线平面与太阳光线垂直。晨昏线上太阳高度角为0°。 3晨昏线永远平分赤道 Template




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tomski晨昏线的六个特点 1平分地球,是过球心的大圆。 2晨昏线平面与太阳光线垂直。晨昏线上太阳高度角为0°。 coloring