- sr is the unit,
steradian.
Because the
surface area A of a
sphere is 4πr2, the
definition implies that a
sphere subtends 4π
steradians (≈ 12.56637 sr)...
-
solid angle of the Sun is 6.794×10−5
steradians and the
average solid angle of the Moon is 6.418×10−5
steradians. In
terms of the
total celestial sphere...
- the
candela as 1 lm = 1 cd·sr. A full
sphere has a
solid angle of 4π
steradians, so a
light source that
uniformly radiates one
candela in all directions...
- 1700 lumens; if that
light is
radiated equally in all
directions (i.e. over 4π
steradians), it will have an
intensity of I V = 1700 lm 4 π sr ≈ 135 lm / sr...
-
factor π {\displaystyle \pi } (which
really should have the
units of
steradians) is a
result of the fact that
intensity is
defined to
exclude the effect...
-
integral divided by π. This
factor is
obtained from the
solid angle 2π
steradians of a
hemisphere decreased by
integration over the
cosine of the zenith...
- directions, the
total radiant flux
would be
about 18.40 mW,
since there are 4π
steradians in a sphere. Note that a
typical modern candle produces very
roughly one...
-
radiant intensity is the watt per
steradian (W/sr),
while that of
spectral intensity in
frequency is the watt per
steradian per
hertz (W·sr−1·Hz−1) and that...
-
computers 4×π = 12.56637..., the
solid angle of a
complete sphere measured in
steradians Hermetic detector (also
called a 4π detector) This
disambiguation page...
- flux, and
radiance to
radiant emittance.[citation needed]
Radians and
steradians are, of course,
dimensionless and so "rad" and "sr" are
included only...
