单词 | steradian |
释义 | ste·ra·di·an ![]() n. Abbr. sr 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. The total solid angle of a sphere is 4π steradians. [STE(REO)- + RADIAN.] ![]() If A = r2 then solid angle Ω = 1 sr. |
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