りったいかく
立体角
1. solid angle
2. Solid angleThe solid angle, Ω, is the two-dimensional angle in three-dimensional space that an object subtends at a point. It is a measure of how large that object appears to an observer looking from that point. A small object nearby may subtend the same solid angle as a larger object farther away (for example, the small/near Moon can totally eclipse the large/remote Sun because, as observed from a point on the Earth, both objects fill almost the same amount of sky).
Read “Solid angle” on English Wikipedia
Read “立体角” on Japanese Wikipedia
Read “Solid angle” on DBpedia
Read “Solid angle” on English Wikipedia
Read “立体角” on Japanese Wikipedia
Read “Solid angle” on DBpedia
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