Everything about Square Degree totally explained
A
square degree is a non-
SI unit measure of
solid angle — that is, the area of the projection of a surface onto a unit sphere centered on the point of observation. It is the three-
dimensional equivalent of the
degree and is denoted "deg²."
The number of square degrees in the whole sky (a sphere) is
(that is, approximately 41,253 deg²), which can be derived from that the fact that the whole sky covers 4π
steradians, and one degree is π/180
radians. Thus, one square degree is approximately 1/3283 steradian.
For example, observed from the surface of the
Earth, the
Moon has a diameter of approximately 0.5°, so it covers an area of approximately 0.2 deg².
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