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# Light Years

A light-year (abbreviation: ly), sometimes referred to incorrectly as a light year, is a unit of length used informally to express astronomical distances. It is approximately 9 trillion kilometers or 6 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word year, the term light-year is sometimes misinterpreted as a unit of time.

The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist and popular science publications. The unit usually used in professional astrometry is the parsec (symbol: pc, approximately 3.26 light-years; the distance at which one astronomical unit subtends an angle of one second of arc).

Light Years
Symbol/abbreviation: ly
Unit of: LENGTH
LENGTH's base unit: meters (SI Unit)
In relation to the base unit (meters), 1 Light Years = 9461000000000000 meters.
[Conversion table] 1 Light Years (ly) to all length units
1 ly= 5.21472440944E+18 agate [typography] (agate)
1 ly= 1.59335643961E+16 alens (aln)
1 ly= 9.461E+25 angstroms (Å)
1 ly= 63242.8787638 astronomical unit (au)
1 ly= 9.461E+33 attometers (am)
1 ly= 8.01032935399E+13 barleycorns (bcorn)
1 ly= 9.461E+27 bicrons (μμ)
1 ly= 1.78787059906E+26 bohr radius (Bohr)
1 ly= 5.10526747479E+13 cable length uk (cbl[UK])
1 ly= 4.31111475649E+13 cable length us (cbl[US])
1 ly= 3.72480314961E+19 calibers (cal)
1 ly= 3.72480314961E+19 centiinch (cin)
1 ly= 9.461E+17 centimeters (cm)
1 ly= 4.70303427981E+14 chains (ch)
1 ly= 2.06933508311E+16 cubits (cbt)
1 ly= 946100000000000 decameters (dam)
1 ly= 9.461E+16 decimeters (dm)
1 ly= 2.51640931069E+19 didot points (didot point)
1 ly= 4.96640419948E+17 digits (digit)
1 ly= 8.27734033246E+15 ells (eel)
1 ly= 2.24326271928E+18 ems (EM)
1 ly= 0.009461 exameters (Em)
1 ly= 5.17333770779E+15 fathoms (fath)
1 ly= 3.10400262467E+16 feet (ft)
1 ly= 9.461E+30 femtometers (fm)
1 ly= 9.461E+30 fermi (fermi)
1 ly= 8.27734033246E+16 finger cloth (finer)
1 ly= 3.01209805794E+16 fods (fod)
1 ly= 4.70303427981E+13 furlongs (fur)
1 ly= 9461000 gigameters (Gm)
1 ly= 3.07175324675E+14 greek plethron (pleth)
1 ly= 5.11405405405E+13 greek stadion (std)
1 ly= 9.31200787402E+16 hands (h)
1 ly= 94610000000000 hectometers (hm)
1 ly= 9.461E+20 himetrics (hiMetric)
1 ly= 4.98870583574E+15 hvats (hvat)
1 ly= 3.72480314961E+17 inches (in)
1 ly= 9461000000000 kilometers (km)
1 ly= 0.000306578094621 kiloparsecs (kpc)
1 ly= 365.28957529 light days (ld)
1 ly= 8768.30398517 light hours (lh)
1 ly= 525903.2796 light minutes (lmin)
1 ly= 12.1747522841 light months (lm)
1 ly= 31557705.1368 light seconds (ls)
1 ly= 1 light years (ly)
1 ly= 4.50523809524E+18 lines (l)
1 ly= 9461000000 megameters (Mm)
1 ly= 9461000000000000 meters (m)
1 ly= 3.72480314961E+23 microinches (μin)
1 ly= 9.461E+21 micrometers (μm)
1 ly= 9.461E+27 micromicrons (μμm)
1 ly= 5.87879284976E+12 miles (mi)
1 ly= 9.461E+18 millimeters (mm)
1 ly= 3.72480314961E+20 mils (mil)
1 ly= 946100000000 myriameters (Mym)
1 ly= 1.65546806649E+17 nails cloth (nail)
1 ly= 9.461E+24 nanometers (nm)
1 ly= 1.7028437725E+12 nautical leagues (Nl)
1 ly= 5.10853131749E+12 nautical miles (NM)
1 ly= 1.24160104987E+16 paces (pace)
1 ly= 1.24160104987E+17 palms (palm)
1 ly= 0.306610128574 parsecs (pc)
1 ly= 1.88121371192E+15 perch (perch)
1 ly= 9.461 petameters (Pm)
1 ly= 2.23488189152E+18 picas (p)
1 ly= 9.461E+27 picometers (pm)
1 ly= 3.57581147412E+19 pixels (PX)
1 ly= 5.913125E+50 planck length (pl)
1 ly= 2.68185657836E+19 points (pt)
1 ly= 1.88121371192E+15 poles (pole)
1 ly= 2.12845894263E+17 rack unit (ru)
1 ly= 2.23488217132E+18 rems (rem)
1 ly= 1.88121371192E+15 rods (rd)
1 ly= 2.66507042254E+14 roman actus (actus)
1 ly= 1.55200131234E+15 ropes (rope)
1 ly= 946100000000 scandinavian miles (mil[Scandinavian])
1 ly= 4.13867016623E+16 spans (span)
1 ly= 9461 terameters (Tm)
1 ly= 3.72480314961E+20 thou (th)
1 ly= 5.36368274846E+20 twips (twip)
1 ly= 1.09249422633E+16 varas [Argentina] (vr[Argentina])
1 ly= 1.12872596485E+16 varas [California] (vr[California])
1 ly= 1.09502314815E+16 varas [Latin America] (vr[Latin])
1 ly= 1.12897066896E+16 varas [Mexico] (vr[Mexico])
1 ly= 1.13183395143E+16 varas [Spanish] (vr[Spanish])
1 ly= 1.11743654553E+16 varas [Texas] (vr[Texas])
1 ly= 8.86857892763E+12 versts (vst)
1 ly= 9.44207807554E+28 x unit (xu)
1 ly= 1.03466754156E+16 yards (yd)
1 ly= 9.461E+39 yoctometers (ym)
1 ly= 9.461E-9 yottameters (Ym)
1 ly= 9.461E+36 zeptometers (zm)
1 ly= 9.461E-6 zettameters (Zm)
1 ly= 3.72480314961E+17 zolls (zoll)