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单词 steradian
释义 ste·ra·di·an AHD[stĭ-rāʹdē-ən] D.J.[stɪˈreɪdiːən]K.K.[stɪˈrediən]n.(名词)abbr. sr【缩写】steradianIf A = r2 then solid angle Ω = 1 sr.
  1. A unit of measure equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared:立体弧度:由球心所张成的立体角,它在球面上所截取平面的面积等于以球半径为边长的正方形面积:The total solid angle of a sphere is 4π steradians. See table at measurement 球的立体角和为4π立体弧度 参见 measurement
Etymology语源
    1. ste(reo)- ste(reo)-
    1. radian radian
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