Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A unit of measure equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared. The total solid angle of a sphere is 4π steradians.
from The Century Dictionary.
- noun A unit of solid angular measure; the solid angle subtended at the center by that part of a sphere which is equal to the square of its radius, hence by the unit surface on a sphere of unit radius.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geometry In the
International System of Units , thederived unit ofsolid angle ; the solid anglesubtended at thecentre of asphere ofradius r by a portion of thesurface of thesphere that hasarea r2. Symbol:sr
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the unit of solid angle adopted under the Systeme International d'Unites
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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(c) In photometry, the unit name steradian and the unit symbol sr are usually retained in expressions for derived units.
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Unit of luminous intensity candela The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.
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There were some say that this “hole,” which is just a cold spot which has “sharp boundaries” in steradian measure from the surrounding.
A Dark, Misleading Force Sean 2007
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A complete steradian sweep showed nothing the size of a spaceship out there.
Warhorse Zahn, Timothy 1990
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An advantage of the moon over the Earth is that the moon subtends less than 0.25 square degree, whereas the Earth subtends a steradian or more, so scattered light and light potentially leaking around the shutter presents additional problems for the Earth.
SpaceRef Top Stories 2010
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More formally, a candela is the intensity of a source that puts out yellow light at 1/683 watt per steradian of solid angle.
BBC News - Home 2010
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My follicular kingman homes for sale drowse fractiousness me this scrum to lender inauspiciously his defenseless panicle, his disorganisation to curb, and his steradian for noncausative to mustache.
Rational Review 2009
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Flying by the seat of one’s pants, 4-pi steradian shots in the dark, gut checks and the like are all risky in foreign territory.
Jonathan Wells: Another ID Creationist Who Doesn't Understand Information Theory - The Panda's Thumb 2009
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k is ~5,000 particles per steradian per square meter per second
Slashdot 2009
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k is ~5,000 particles per steradian per square meter per second
Slashdot 2009
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