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Anno luminal




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Anno luminal
instantia de: unitate de longitude, Q21652125[*]



1e16m comparison 10 light years sirius.png










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 unitate de longitude, que
equala circa 10 billion kilometros (1016 metros, 10 petametros, o circa 6 billion millias).
Como definite per le Union Astronomic International (UAI), un anno luminal es le distantia que lumine propaga in un vacuo in 1 Anno Julian.
[1]


Le anno luminal es frequentemente usate de mesurar distantias a stellas e altere distantias de un scala 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.[1]



Valor numeric |


Un anno luminal equala:


  • exactemente 9.460.730.472.580,8 km (circa 9,5 Pm)

  • circa 5.878.625.373.183,608 millias (circa 6 billion millias (Scala breve))

  • circa 63.241,1 unitates astronomic

  • circa 0,306601 parseces

  • exactemente 31.557.600 secundas luminal

Le figuras supra es basate sur un Anno Julian (non anno Gregorian) de exactemente 365,25 dies
(cata de exactemente 86.400 SI secundas, 31.557.600 secundas total in 1 anno)[2]
e un definite rapiditate de lumine de 299.792.458 m/s, ambe includite in le IAU (1976) Systema de Constantes Astronomic,
usava postea 1984.[3]



Vide etiam |


  • Rapiditate de lumine

  • Secunda luminal


Referentias |



  1. 1,01,1 http://www.iau.org/public_press/themes/measuring/


  2. IAU Recommendations concerning Units


  3. Astronomical Constants pagine K6 del Almanac Astronomic.




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