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Liichtjoer Beispill | Kuckt och | Navigatiounsmenü

LängteneenheetenAstronomesch Moosseenheeten


Liichttropesche JoerVakuumBilliounenKilometerInternationalen EenheetesystemEenheetenzeechenFormelzeechenIAUSaturn 01.svg












Liichtjoer




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D'Liichtjoer ass d'Distanz, déi eng elektromagnetesch Well wéi d'Liicht an engem tropesche Joer am Vakuum zréckleet. Dat si ronn 9,5 Billiounen (9,5 · 1012) Kilometer.


E Liichtjoer ass eng astronomesch Längeneenheet an net, wéi den Numm menge loosse kéint, eng Zäiteenheet. Kuckt och: Astronomesch Moosseenheeten.

D'Liichtjoer ass am Internationalen Eenheetesystem zanter 1978 net méi zoulässeg. Trotzdeem gëllt et an der Astronomie als onverzichtbar a gëtt och weiderhin ugewennt.


Eenheetenzeechen: Lj, ly

Dat normaalt Formelzeechen: d (Ofstand vun der Äerd) oder l (als Gréisst vum Objet)


Analog zum Liichtjoer existéieren d'Eenheete Liichtsekonn Ls (zirka 300.000 km), Liichtminutt Lm (zirka 18 Millioune km) an d'Liichtstonn Lh (zirka 1,1 Milliarde km).


Vun der IAU exakt festgeluecht sinn:


  • eng Liichtsekonn (1 Ls) = 299.792,458 km (zirka 300 Millioune Meter),

  • eng Liichtminutt (1 Lm) = 17.987.547,48 km (zirka 18 Milliarde Meter),

  • eng Liichtstonn (1 Lh) = 1.079.252.848,8 km (zirka 1,1 Billioune Meter).

  • ee Liichtdag (1 Ld) = 25.902.068.371,2 km (zirka 26 Billioune Meter)

Demno ass e Liichtjoer (1 Lj):


  • 63240 AE (Astronomesch Eenheet),

  • 0,3066 pc (Parsec),

  • 9,461 · 1015 m, ronn 9½ Billiarde Meter (9,5 Petameter), oder méi genee:
    • 9,460 528 191 · 1015 m geméiss dem tropesche Joer (zu der Equinoxe J2000.0),

    • 9,460 536 207 068 016 · 1015 m geméiss dem gregorianesche Joer (exakt),

    • 9,460 730 472 580 8 · 1015 m geméiss dem julianesche Joer (exakt) an

    • 9,460 895 221 · 1015 m geméiss dem sideresche Joer (zu der Equinoxe J2000.0).



Beispill |


  • Eng Liichtsekonn entsprécht am Vakuum genee 299.792,458 km.

  • Eng Liichtminutt ass 17.987.547,48 km (17.987.547.480 Meter) laang.

  • Eng Liichtstonn ass 1.079.252.848,8 km (1.079.252.848.800 Meter) laang.

  • E Liichtjoer ass 9.460.528.000.000 km (9.460.528.000.000.000 Meter) laang.

  • D'Distanz tëscht der Äerd an dem Mound läit bei ongeféier 1,3 Liichtsekonnen.

  • Eis Äerd ass vun der Sonn am Duerchschnëtt ongeféier 500 Liichtsekonne bzw. 8,3 Liichtminutten ewech.

  • Eist Sonnesystem huet en Duerchmiesser vu ronn 150 Liichtstonnen.

  • De sonnennooste Stär, Proxima Centauri, ass ongeféier 4,2 Liichtjoer ewech.

  • Den Duerchmiesser vun eiser Galaxis, der Mëllechstrooss, ass ongeféier 100.000 Liichtjoer.

  • D'Distanz zum Andromedaniwwel ass ongeféier 2,5 Millioune Liichtjoer.


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