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maxnoe
on Jan 31, 2024
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NASA's Webb depicts structure in 19 nearby spiral ...
The "area" in a spherical coordinate system is cold "solid angle" with unit steradian.
The whole sky has 4pi steradian.
https://en.m.wikipedia.org/wiki/Solid_angle
wolverine876
on Jan 31, 2024
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The whole sky has 4pi steradian.
https://en.m.wikipedia.org/wiki/Solid_angle