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The astronomical unit (symbol au, or ua) is a unit of length, roughly the distance from Earth to the Sun. However, that distance varies as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 149597870700 meters (about 150 million kilometers, or 93 million miles). The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. However, it is also a fundamental component in the definition of another unit of astronomical length, the parsec.
Astronomical UnitConversion table | ||
|---|---|---|
| 1 au | = 82455519283270 agate [typography] (agate) | ⇛ |
| 1 au | = 251942427472.89 alens (aln) | ⇛ |
| 1 au | = 1.495978707E+21 angstroms (Å) | ⇛ |
| 1 au | = 1 astronomical unit (au) | ⇛ |
| 1 au | = 1.495978707E+29 attometers (am) | ⇛ |
| 1 au | = 17669039846457 barleycorns (bcorn) | ⇛ |
| 1 au | = 1.495978707E+23 bicrons (μμ) | ⇛ |
| 1 au | = 1859116145.4605 blocks (bl) | ⇛ |
| 1 au | = 2.826991171196E+21 bohr radius (Bohr) | ⇛ |
| 1 au | = 807247800.00259 cable length uk (cbl[UK]) | ⇛ |
| 1 au | = 681675920.00219 cable length us (cbl[US]) | ⇛ |
| 1 au | = 5.8896799488189E+14 calibers (cal) | ⇛ |
| 1 au | = 5.8896799488189E+14 centiinch (cin) | ⇛ |
| 1 au | = 14959787070000 centimeters (cm) | ⇛ |
| 1 au | = 7436464581.842 chains (ch) | ⇛ |
| 1 au | = 327204441601.05 cubits (cbt) | ⇛ |
| 1 au | = 14959787070 decameters (dam) | ⇛ |
| 1 au | = 1495978707000 decimeters (dm) | ⇛ |
| 1 au | = 3.9789607302425E+14 didot points (didot point) | ⇛ |
| 1 au | = 7852906598425.2 digits (digit) | ⇛ |
| 1 au | = 3739.9467675 earth circumference (Ec) | ⇛ |
| 1 au | = 389.17037554435 earth to moon distance (EM d) | ⇛ |
| 1 au | = 130881776640.42 ells (eel) | ⇛ |
| 1 au | = 35470597846468 ems (EM) | ⇛ |
| 1 au | = 1.495978707E-7 exameters (Em) | ⇛ |
| 1 au | = 81801110400.262 fathoms (fath) | ⇛ |
| 1 au | = 490806662401.57 feet (ft) | ⇛ |
| 1 au | = 1.495978707E+26 femtometers (fm) | ⇛ |
| 1 au | = 1.495978707E+26 fermi (fermi) | ⇛ |
| 1 au | = 1308817766404.2 finger cloth (finer) | ⇛ |
| 1 au | = 6731062798650.2 fingerbreadth (fb) | ⇛ |
| 1 au | = 476274659980.9 fods (fod) | ⇛ |
| 1 au | = 1636022208.0052 football field length [US] (fbf[US]) | ⇛ |
| 1 au | = 743646458.1842 furlongs (fur) | ⇛ |
| 1 au | = 149.5978707 gigameters (Gm) | ⇛ |
| 1 au | = 4857073724.026 greek plethron (pleth) | ⇛ |
| 1 au | = 808637138.91892 greek stadion (std) | ⇛ |
| 1 au | = 1472419987204.7 hands (h) | ⇛ |
| 1 au | = 1495978707 hectometers (hm) | ⇛ |
| 1 au | = 1.495978707E+16 himetrics (hiMetric) | ⇛ |
| 1 au | = 62332446125 horse length (hl) | ⇛ |
| 1 au | = 78881700726.751 hvats (hvat) | ⇛ |
| 1 au | = 5889679948818.9 inches (in) | ⇛ |
| 1 au | = 149597870.7 kilometers (km) | ⇛ |
| 1 au | = 4.8476302883992E-9 kiloparsecs (kpc) | ⇛ |
| 1 au | = 0.0057759795637066 light days (ld) | ⇛ |
| 1 au | = 0.1386449218721 light hours (lh) | ⇛ |
| 1 au | = 8.3156126014452 light minutes (lmin) | ⇛ |
| 1 au | = 0.00019250787633509 light months (lm) | ⇛ |
| 1 au | = 498.99223048699 light seconds (ls) | ⇛ |
| 1 au | = 1.5812056939013E-5 light years (ly) | ⇛ |
| 1 au | = 71237081285714 lines (l) | ⇛ |
| 1 au | = 743644970890.57 links (li) | ⇛ |
| 1 au | = 389.17037554435 lunar distance (LD) | ⇛ |
| 1 au | = 149597.8707 megameters (Mm) | ⇛ |
| 1 au | = 149597870700 meters (m) | ⇛ |
| 1 au | = 498659569000 metric foot (mf) | ⇛ |
| 1 au | = 5.8896799488189E+18 microinches (μin) | ⇛ |
| 1 au | = 1.495978707E+17 micrometers (μm) | ⇛ |
| 1 au | = 1.495978707E+23 micromicrons (μμm) | ⇛ |
| 1 au | = 92955807.273026 miles (mi) | ⇛ |
| 1 au | = 1.495978707E+14 millimeters (mm) | ⇛ |
| 1 au | = 5.8896799488189E+15 mils (mil) | ⇛ |
| 1 au | = 14959787.07 myriameters (Mym) | ⇛ |
| 1 au | = 2617635532808.4 nails cloth (nail) | ⇛ |
| 1 au | = 1.495978707E+20 nanometers (nm) | ⇛ |
| 1 au | = 26925462.688985 nautical leagues (Nl) | ⇛ |
| 1 au | = 80776388.066955 nautical miles (NM) | ⇛ |
| 1 au | = 196322664960.63 paces (pace) | ⇛ |
| 1 au | = 1963226649606.3 palms (palm) | ⇛ |
| 1 au | = 4.8481368110954E-6 parsecs (pc) | ⇛ |
| 1 au | = 29745858327.368 perch (perch) | ⇛ |
| 1 au | = 0.0001495978707 petameters (Pm) | ⇛ |
| 1 au | = 35338079720739 picas (p) | ⇛ |
| 1 au | = 1.495978707E+23 picometers (pm) | ⇛ |
| 1 au | = 5.6540934631929E+14 pixels (PX) | ⇛ |
| 1 au | = 9.34986691875E+45 planck length (pl) | ⇛ |
| 1 au | = 4.2405668919264E+14 points (pt) | ⇛ |
| 1 au | = 29745858327.368 poles (pole) | ⇛ |
| 1 au | = 3365531399325.1 rack unit (ru) | ⇛ |
| 1 au | = 35338084144955 rems (rem) | ⇛ |
| 1 au | = 29745858327.368 rods (rd) | ⇛ |
| 1 au | = 4214024526.7606 roman actus (actus) | ⇛ |
| 1 au | = 24540333120.079 ropes (rope) | ⇛ |
| 1 au | = 14959787.07 scandinavian miles (mil[Scandinavian]) | ⇛ |
| 1 au | = 9.9998576671123E-7 siriometer (sir) | ⇛ |
| 1 au | = 654408883202.1 spans (span) | ⇛ |
| 1 au | = 0.1495978707 terameters (Tm) | ⇛ |
| 1 au | = 5.8896799488189E+15 thou (th) | ⇛ |
| 1 au | = 8.4810857021373E+15 twips (twip) | ⇛ |
| 1 au | = 172745809122.4 varas [Argentina] (vr[Argentina]) | ⇛ |
| 1 au | = 178474792248.09 varas [California] (vr[California]) | ⇛ |
| 1 au | = 173145683680.56 varas [Latin America] (vr[Latin]) | ⇛ |
| 1 au | = 178513485000.36 varas [Mexico] (vr[Mexico]) | ⇛ |
| 1 au | = 178966228855.13 varas [Spanish] (vr[Spanish]) | ⇛ |
| 1 au | = 176689702835.82 varas [Texas] (vr[Texas]) | ⇛ |
| 1 au | = 140230474.97188 versts (vst) | ⇛ |
| 1 au | = 1.4929867615299E+24 x unit (xu) | ⇛ |
| 1 au | = 163602220800.52 yards (yd) | ⇛ |
| 1 au | = 1.495978707E+35 yoctometers (ym) | ⇛ |
| 1 au | = 1.495978707E-13 yottameters (Ym) | ⇛ |
| 1 au | = 1.495978707E+32 zeptometers (zm) | ⇛ |
| 1 au | = 1.495978707E-10 zettameters (Zm) | ⇛ |
| 1 au | = 5889679948818.9 zolls (zoll) | ⇛ |