apparent horizon
(*) The visible line of demarcation between land/sea and sky. | ||||
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Apparent horizon definition was found in categories: Language, Idioms & Slang(2) Encyclopedia(1)
Apparent horizon Definition from Language, Idioms & Slang Dictionaries & Glossaries
| WordNet 2.0 |
apparent horizon
Noun
1. the line at which the sky and Earth appear to meet
(synonym) horizon, visible horizon, sensible horizon, skyline
(hypernym) line
(part-holonym) perspective, linear perspective
Noun
1. the line at which the sky and Earth appear to meet
(synonym) horizon, visible horizon, sensible horizon, skyline
(hypernym) line
(part-holonym) perspective, linear perspective
| hEnglish - advanced version |
apparent horizon
apparent horizon
n : the line at which the sky and earth appear to meet [syn: horizon, visible horizon, sensible horizon, skyline]
apparent horizon
n : the line at which the sky and earth appear to meet [syn: horizon, visible horizon, sensible horizon, skyline]
Apparent horizon Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Apparent horizon
An apparent horizon is a surface defined in general relativity as the boundary between light rays which are directed outwards and moving outwards, and those which are directed outwards but moving inwards.
Apparent horizons are not invariant properties of a spacetime. They are observer-dependent, and in particular they are distinct from absolute horizons.
See, however the articles on ergosphere, Cauchy horizon, the Reissner-Nordström solution, photon sphere, Killing horizon and naked singularity; the notion of a horizon in general relativity is subtle, and depends on fine distinctions.
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