3 ms·
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_
by maxnoe 3y ago
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 https://en.m.wikipedia.org/wiki/Solid_angle
- wolverine876 3y agoThanks!