| astronomical unit | 1 AU | 2 AU | 3 AU | 4 AU | 5 AU | 6 AU | 7 AU | 8 AU | 9 AU | 10 AU | 11 AU | 12 AU | 13 AU | 14 AU | 15 AU | 16 AU | 17 AU | 18 AU | 19 AU | 20 AU | 21 AU | 22 AU | 23 AU | 24 AU | 25 AU | 26 AU | 27 AU | 28 AU | 29 AU | 30 AU | 31 AU | 32 AU | 33 AU | 34 AU | 35 AU | 36 AU | 37 AU | 38 AU | 39 AU | 40 AU | 41 AU | 42 AU | 43 AU | 44 AU | 45 AU | 46 AU | 47 AU | 48 AU | 49 AU | 50 AU | 51 AU | 52 AU | 53 AU | 54 AU | 55 AU | 56 AU | 57 AU | 58 AU | 59 AU | 60 AU | 61 AU | 62 AU | 63 AU | 64 AU | 65 AU | 66 AU | 67 AU | 68 AU | 69 AU | 70 AU | 71 AU | 72 AU | 73 AU | 74 AU | 75 AU | 76 AU | 77 AU | 78 AU | 79 AU | 80 AU | 81 AU | 82 AU | 83 AU | 84 AU | 85 AU | 86 AU | 87 AU | 88 AU | 89 AU | 90 AU | 91 AU | 92 AU | 93 AU | 94 AU | 95 AU | 96 AU | 97 AU | 98 AU | 99 AU | 100 AU |
| mile (US Survey) | 92,955,621.343762 mi (US) | 185,911,242.68752 mi (US) | 278,866,864.03129 mi (US) | 371,822,485.37505 mi (US) | 464,778,106.71881 mi (US) | 557,733,728.06257 mi (US) | 650,689,349.40633 mi (US) | 743,644,970.75009 mi (US) | 836,600,592.09386 mi (US) | 929,556,213.43762 mi (US) | 1,022,511,834.7814 mi (US) | 1,115,467,456.1251 mi (US) | 1,208,423,077.4689 mi (US) | 1,301,378,698.8127 mi (US) | 1,394,334,320.1564 mi (US) | 1,487,289,941.5002 mi (US) | 1,580,245,562.8439 mi (US) | 1,673,201,184.1877 mi (US) | 1,766,156,805.5315 mi (US) | 1,859,112,426.8752 mi (US) | 1,952,068,048.219 mi (US) | 2,045,023,669.5628 mi (US) | 2,137,979,290.9065 mi (US) | 2,230,934,912.2503 mi (US) | 2,323,890,533.594 mi (US) | 2,416,846,154.9378 mi (US) | 2,509,801,776.2816 mi (US) | 2,602,757,397.6253 mi (US) | 2,695,713,018.9691 mi (US) | 2,788,668,640.3129 mi (US) | 2,881,624,261.6566 mi (US) | 2,974,579,883.0004 mi (US) | 3,067,535,504.3441 mi (US) | 3,160,491,125.6879 mi (US) | 3,253,446,747.0317 mi (US) | 3,346,402,368.3754 mi (US) | 3,439,357,989.7192 mi (US) | 3,532,313,611.0629 mi (US) | 3,625,269,232.4067 mi (US) | 3,718,224,853.7505 mi (US) | 3,811,180,475.0942 mi (US) | 3,904,136,096.438 mi (US) | 3,997,091,717.7818 mi (US) | 4,090,047,339.1255 mi (US) | 4,183,002,960.4693 mi (US) | 4,275,958,581.813 mi (US) | 4,368,914,203.1568 mi (US) | 4,461,869,824.5006 mi (US) | 4,554,825,445.8443 mi (US) | 4,647,781,067.1881 mi (US) | 4,740,736,688.5318 mi (US) | 4,833,692,309.8756 mi (US) | 4,926,647,931.2194 mi (US) | 5,019,603,552.5631 mi (US) | 5,112,559,173.9069 mi (US) | 5,205,514,795.2507 mi (US) | 5,298,470,416.5944 mi (US) | 5,391,426,037.9382 mi (US) | 5,484,381,659.2819 mi (US) | 5,577,337,280.6257 mi (US) | 5,670,292,901.9695 mi (US) | 5,763,248,523.3132 mi (US) | 5,856,204,144.657 mi (US) | 5,949,159,766.0008 mi (US) | 6,042,115,387.3445 mi (US) | 6,135,071,008.6883 mi (US) | 6,228,026,630.032 mi (US) | 6,320,982,251.3758 mi (US) | 6,413,937,872.7196 mi (US) | 6,506,893,494.0633 mi (US) | 6,599,849,115.4071 mi (US) | 6,692,804,736.7508 mi (US) | 6,785,760,358.0946 mi (US) | 6,878,715,979.4384 mi (US) | 6,971,671,600.7821 mi (US) | 7,064,627,222.1259 mi (US) | 7,157,582,843.4697 mi (US) | 7,250,538,464.8134 mi (US) | 7,343,494,086.1572 mi (US) | 7,436,449,707.5009 mi (US) | 7,529,405,328.8447 mi (US) | 7,622,360,950.1885 mi (US) | 7,715,316,571.5322 mi (US) | 7,808,272,192.876 mi (US) | 7,901,227,814.2197 mi (US) | 7,994,183,435.5635 mi (US) | 8,087,139,056.9073 mi (US) | 8,180,094,678.251 mi (US) | 8,273,050,299.5948 mi (US) | 8,366,005,920.9386 mi (US) | 8,458,961,542.2823 mi (US) | 8,551,917,163.6261 mi (US) | 8,644,872,784.9698 mi (US) | 8,737,828,406.3136 mi (US) | 8,830,784,027.6574 mi (US) | 8,923,739,649.0011 mi (US) | 9,016,695,270.3449 mi (US) | 9,109,650,891.6887 mi (US) | 9,202,606,513.0324 mi (US) | 9,295,562,134.3762 mi (US) |
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 149 597 870 700 metres (about 150 million kilometres, 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.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| astronomical unit | AU | ≡ 149 597 870 700 m ≈ Distance from Earth to Sun | ≡ 149 597 870 700 m | Science - Astronomy (Length) |
| astronomical units | miles (US Survey) | astronomical units | miles (US Survey) |
|---|---|---|---|
| 1 | ≈ 92955621.343762 | 4 | ≈ 371822485.37505 |
| 1.5 | ≈ 139433432.01564 | 4.5 | ≈ 418300296.04693 |
| 2 | ≈ 185911242.68752 | 5 | ≈ 464778106.71881 |
| 2.5 | ≈ 232389053.3594 | 5.5 | ≈ 511255917.39069 |
| 3 | ≈ 278866864.03129 | 6 | ≈ 557733728.06257 |
≡ 5280 US Survey feet ≡ (5280 × 1200⁄3937) m
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| mile (US Survey) | mi (US) | ≡ 5280 US Survey feet ≡ (5280 × 1200⁄3937) m | ≈ 1609.347219 m | Imperial/US |
| miles (US Survey) | astronomical units | miles (US Survey) | astronomical units |
|---|---|---|---|
| 1 | ≈ 1.0757821695386E-8 | 4 | ≈ 4.3031286781544E-8 |
| 1.5 | ≈ 1.6136732543079E-8 | 4.5 | ≈ 4.8410197629237E-8 |
| 2 | ≈ 2.1515643390772E-8 | 5 | ≈ 5.378910847693E-8 |
| 2.5 | ≈ 2.6894554238465E-8 | 5.5 | ≈ 5.9168019324623E-8 |
| 3 | ≈ 3.2273465086158E-8 | 6 | ≈ 6.4546930172316E-8 |
| astronomical units | miles (US Survey) |
|---|---|
| 1 | ≈ 92,955,621.343762 |
| 1.0757821695386 × 10-8 | ≈ 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |