下图为某日光照示意图mn两点在同一纬线上om是晨昏线的一段o为晨昏线与纬线的切点m点正值日落且om所在晨昏线平面与赤道平面夹角为 Template




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tomski下图为某日光照示意图mn两点在同一纬线上om是晨昏线的一段o为晨昏线与纬线的切点m点正值日落且om所在晨昏线平面与赤道平面夹角为 coloring