Le texto fonte de Anno luminal

{{infobox}}
[[File:1e15m comparison light year month comet 1910a1.png|thumb|Imagine monstrar le scala de un anno luminal (scaliar exterior) e un mense luminal (scaliar interior) circumferente le Sol comparate al orbitas de 
[[Cometa 1910 A1]] (linea jalne) e [[Cometa Hyakutake]] (linea orange).]]

Un '''anno luminal''', anque '''anno de lumine''' o '''anno-lumine''', es un [[Unitates de mesuration|unitate]] de [[longitude]], que
equala circa 10 billion [[kilometro]]s (10<sup>16</sup> metros, 10 [[petametro]]s, o circa 6 billion millias). 
Como definite per le [[Union Astronomic International]] (UAI), un anno luminal es le distantia que [[Velocitate de lumine|lumine propaga]] in un [[vacuo]] in 1 [[Anno Julian (astronomia)|Anno Julian]].
<ref name="IAUgen">http://www.iau.org/public_press/themes/measuring/</ref>

Le anno luminal es frequentemente usate de mesurar distantias a stellas e altere distantias de un scala [[Galaxia|galaxic]], presertim in publicationes nonspecialistic
o scientific popular. Le unitate preferite in [[astrometria]] es le [[parsec]], proque illo pote esser plus facilemente derivate ab,
e comparate con, datos observational. Le parsec es definite como le distantia al qual un objecto appare de mover 1 [[arcsecunda]] de [[parallaxe]] 
quando le observator move se 1 [[unitate astronomic]] perpendicular al linea de vista al observator, e illo equala approximatemente 3,26 annos luminal.<ref name="IAUgen"/>

== Valor numeric ==
Un anno luminal equala:
* exactemente 9.460.730.472.580,8 [[kilometro|km]] (circa 9,5&nbsp;[[Petametro|Pm]])
* circa 5.878.625.373.183,608 [[millia]]s (circa 6 billion millias ([[Scala breve]]))
* circa 63.241,1 [[unitate astronomic|unitates astronomic]]
* circa 0,306601 [[parsec]]es
* exactemente 31.557.600 [[secunda luminal|secundas luminal]]

Le figuras supra es basate sur un [[Anno Julian (astronomia)|Anno Julian]] (non [[Calendario Gregorian|anno Gregorian]]) de exactemente 365,25 dies 
(cata de exactemente 86.400 [[Systema International de Unitates|SI]] secundas, 31.557.600 secundas total in 1 anno)<ref>{{Cite web |title=IAU Recommendations concerning Units |url=http://www.iau.org/Units.234.0.html |accessdate=2011-07-28 |archivedate=2007-02-16 |archiveurl=https://web.archive.org/web/20070216041250/http://www.iau.org/Units.234.0.html }}</ref> 
e un definite [[velocitate de lumine]] de 299.792.458 m/s, ambe includite in le [[Constante astronomic|IAU (1976) Systema de Constantes Astronomic]], 
usava postea 1984.<ref>[http://asa.usno.navy.mil/SecK/2009/Astronomical_Constants_2009.pdf Astronomical Constants] {{Webarchive|url=https://web.archive.org/web/20090327014818/http://asa.usno.navy.mil/SecK/2009/Astronomical_Constants_2009.pdf |date=2009-03-27 }} pagine K6 del [[Almanac Astronomic]].</ref>

== Vide etiam ==
* [[Velocitate de lumine]]
* [[Secunda luminal]]

== Referentias ==
<references/>

{{traducite|en|Light year}}

[[Categoria:Unitates de longitude]]
[[Categoria:Unitates de mesura astronomic]]