Square degree
Measure of solid angle / From Wikipedia, the free encyclopedia
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A square degree (deg2) is a non-SI unit measure of solid angle. Other denotations include sq. deg. and (°)2. Just as degrees are used to measure parts of a circle, square degrees are used to measure parts of a sphere. Analogous to one degree being equal to π/180 radians, a square degree is equal to (π/180)2 steradians (sr), or about 1/3283 sr or about 3.046×10−4 sr.
Quick Facts Unit of, Symbol ...
Square degree | |
---|---|
Unit of | Solid angle |
Symbol | deg2 |
Conversions | |
1 deg2 in ... | ... is equal to ... |
SI units | ≈ 3.04617×10−4 sr |
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The whole sphere has a solid angle of 4πsr which is approximately 41253 deg2: