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The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in one second, and is equal to exactly 299792458 meters (just over 186282 miles).
Just as the second forms the basis for other units of time, the light-second can form the basis for other units of length, ranging from the light-nanosecond (just under one international foot) to the light-minute, light-hour and light-day, which are sometimes used in popular science publications. The more commonly used light-year is also presently defined to be equal to precisely 31557600 light-seconds, since the definition of a year is based on a Julian year (not Gregorian year) of exactly 365.25 days, each of exactly 86400 SI seconds.
Light SecondsConversion table | ||
|---|---|---|
| 1 ls | = 165244094487.8 agate [typography] (agate) | ⇛ |
| 1 ls | = 504902505.65026 alens (aln) | ⇛ |
| 1 ls | = 2.998E+18 angstroms (Å) | ⇛ |
| 1 ls | = 0.0020040392192561 astronomical unit (au) | ⇛ |
| 1 ls | = 2.998E+26 attometers (am) | ⇛ |
| 1 ls | = 35409448818.898 barleycorns (bcorn) | ⇛ |
| 1 ls | = 2.998E+20 bicrons (μμ) | ⇛ |
| 1 ls | = 3725741.6686551 blocks (bl) | ⇛ |
| 1 ls | = 5.6654011795675E+18 bohr radius (Bohr) | ⇛ |
| 1 ls | = 1617756.2508634 cable length uk (cbl[UK]) | ⇛ |
| 1 ls | = 1366105.2785069 cable length us (cbl[US]) | ⇛ |
| 1 ls | = 1180314960629.9 calibers (cal) | ⇛ |
| 1 ls | = 1180314960629.9 centiinch (cin) | ⇛ |
| 1 ls | = 29980000000 centimeters (cm) | ⇛ |
| 1 ls | = 14902966.67462 chains (ch) | ⇛ |
| 1 ls | = 655730533.68329 cubits (cbt) | ⇛ |
| 1 ls | = 29980000 decameters (dam) | ⇛ |
| 1 ls | = 2998000000 decimeters (dm) | ⇛ |
| 1 ls | = 797399335528.57 didot points (didot point) | ⇛ |
| 1 ls | = 15737532808.399 digits (digit) | ⇛ |
| 1 ls | = 7.495 earth circumference (Ec) | ⇛ |
| 1 ls | = 0.7799126955635 earth to moon distance (EM d) | ⇛ |
| 1 ls | = 262292213.47332 ells (eel) | ⇛ |
| 1 ls | = 71084469214.782 ems (EM) | ⇛ |
| 1 ls | = 2.998E-10 exameters (Em) | ⇛ |
| 1 ls | = 163932633.42082 fathoms (fath) | ⇛ |
| 1 ls | = 983595800.52493 feet (ft) | ⇛ |
| 1 ls | = 2.998E+23 femtometers (fm) | ⇛ |
| 1 ls | = 2.998E+23 fermi (fermi) | ⇛ |
| 1 ls | = 2622922134.7332 finger cloth (finer) | ⇛ |
| 1 ls | = 13489313835.771 fingerbreadth (fb) | ⇛ |
| 1 ls | = 954473097.73957 fods (fod) | ⇛ |
| 1 ls | = 3278652.6684164 football field length [US] (fbf[US]) | ⇛ |
| 1 ls | = 1490296.667462 furlongs (fur) | ⇛ |
| 1 ls | = 0.2998 gigameters (Gm) | ⇛ |
| 1 ls | = 9733766.2337662 greek plethron (pleth) | ⇛ |
| 1 ls | = 1620540.5405405 greek stadion (std) | ⇛ |
| 1 ls | = 2950787401.5748 hands (h) | ⇛ |
| 1 ls | = 2998000 hectometers (hm) | ⇛ |
| 1 ls | = 29980000000000 himetrics (hiMetric) | ⇛ |
| 1 ls | = 124916666.66667 horse length (hl) | ⇛ |
| 1 ls | = 158082021.93803 hvats (hvat) | ⇛ |
| 1 ls | = 11803149606.299 inches (in) | ⇛ |
| 1 ls | = 299800 kilometers (km) | ⇛ |
| 1 ls | = 9.7148412184057E-12 kiloparsecs (kpc) | ⇛ |
| 1 ls | = 1.157528957529E-5 light days (ld) | ⇛ |
| 1 ls | = 0.00027784986098239 light hours (lh) | ⇛ |
| 1 ls | = 0.016664813785436 light minutes (lmin) | ⇛ |
| 1 ls | = 3.8579333419122E-7 light months (lm) | ⇛ |
| 1 ls | = 1 light seconds (ls) | ⇛ |
| 1 ls | = 3.1687982242892E-8 light years (ly) | ⇛ |
| 1 ls | = 142761904761.9 lines (l) | ⇛ |
| 1 ls | = 1490293686.8672 links (li) | ⇛ |
| 1 ls | = 0.7799126955635 lunar distance (LD) | ⇛ |
| 1 ls | = 299.8 megameters (Mm) | ⇛ |
| 1 ls | = 299800000 meters (m) | ⇛ |
| 1 ls | = 999333333.33333 metric foot (mf) | ⇛ |
| 1 ls | = 1.1803149606299E+16 microinches (μin) | ⇛ |
| 1 ls | = 2.998E+14 micrometers (μm) | ⇛ |
| 1 ls | = 2.998E+20 micromicrons (μμm) | ⇛ |
| 1 ls | = 186287.08343275 miles (mi) | ⇛ |
| 1 ls | = 299800000000 millimeters (mm) | ⇛ |
| 1 ls | = 11803149606299 mils (mil) | ⇛ |
| 1 ls | = 29980 myriameters (Mym) | ⇛ |
| 1 ls | = 5245844269.4663 nails cloth (nail) | ⇛ |
| 1 ls | = 2.998E+17 nanometers (nm) | ⇛ |
| 1 ls | = 53959.683225342 nautical leagues (Nl) | ⇛ |
| 1 ls | = 161879.04967603 nautical miles (NM) | ⇛ |
| 1 ls | = 393438320.20997 paces (pace) | ⇛ |
| 1 ls | = 3934383202.0997 palms (palm) | ⇛ |
| 1 ls | = 9.7158563097542E-9 parsecs (pc) | ⇛ |
| 1 ls | = 59611866.698481 perch (perch) | ⇛ |
| 1 ls | = 2.998E-7 petameters (Pm) | ⇛ |
| 1 ls | = 70818897693.558 picas (p) | ⇛ |
| 1 ls | = 2.998E+20 picometers (pm) | ⇛ |
| 1 ls | = 1133102504957.8 pixels (PX) | ⇛ |
| 1 ls | = 1.87375E+43 planck length (pl) | ⇛ |
| 1 ls | = 849826236329.93 points (pt) | ⇛ |
| 1 ls | = 59611866.698481 poles (pole) | ⇛ |
| 1 ls | = 6744656917.8853 rack unit (ru) | ⇛ |
| 1 ls | = 70818906559.862 rems (rem) | ⇛ |
| 1 ls | = 59611866.698481 rods (rd) | ⇛ |
| 1 ls | = 8445070.4225352 roman actus (actus) | ⇛ |
| 1 ls | = 49179790.026247 ropes (rope) | ⇛ |
| 1 ls | = 29980 scandinavian miles (mil[Scandinavian]) | ⇛ |
| 1 ls | = 2.0040106951872E-9 siriometer (sir) | ⇛ |
| 1 ls | = 1311461067.3666 spans (span) | ⇛ |
| 1 ls | = 0.0002998 terameters (Tm) | ⇛ |
| 1 ls | = 11803149606299 thou (th) | ⇛ |
| 1 ls | = 16996428368955 twips (twip) | ⇛ |
| 1 ls | = 346189376.44342 varas [Argentina] (vr[Argentina]) | ⇛ |
| 1 ls | = 357670483.31375 varas [California] (vr[California]) | ⇛ |
| 1 ls | = 346990740.74074 varas [Latin America] (vr[Latin]) | ⇛ |
| 1 ls | = 357748025.1068 varas [Mexico] (vr[Mexico]) | ⇛ |
| 1 ls | = 358655341.54803 varas [Spanish] (vr[Spanish]) | ⇛ |
| 1 ls | = 354093094.12168 varas [Texas] (vr[Texas]) | ⇛ |
| 1 ls | = 281027.37157855 versts (vst) | ⇛ |
| 1 ls | = 2.992004023936E+21 x unit (xu) | ⇛ |
| 1 ls | = 327865266.84164 yards (yd) | ⇛ |
| 1 ls | = 2.998E+32 yoctometers (ym) | ⇛ |
| 1 ls | = 2.998E-16 yottameters (Ym) | ⇛ |
| 1 ls | = 2.998E+29 zeptometers (zm) | ⇛ |
| 1 ls | = 2.998E-13 zettameters (Zm) | ⇛ |
| 1 ls | = 11803149606.299 zolls (zoll) | ⇛ |