| 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 |
| chain | 7,436,449,795.2959 ch | 14,872,899,590.592 ch | 22,309,349,385.888 ch | 29,745,799,181.184 ch | 37,182,248,976.479 ch | 44,618,698,771.775 ch | 52,055,148,567.071 ch | 59,491,598,362.367 ch | 66,928,048,157.663 ch | 74,364,497,952.959 ch | 81,800,947,748.255 ch | 89,237,397,543.551 ch | 96,673,847,338.846 ch | 104,110,297,134.14 ch | 111,546,746,929.44 ch | 118,983,196,724.73 ch | 126,419,646,520.03 ch | 133,856,096,315.33 ch | 141,292,546,110.62 ch | 148,728,995,905.92 ch | 156,165,445,701.21 ch | 163,601,895,496.51 ch | 171,038,345,291.81 ch | 178,474,795,087.1 ch | 185,911,244,882.4 ch | 193,347,694,677.69 ch | 200,784,144,472.99 ch | 208,220,594,268.28 ch | 215,657,044,063.58 ch | 223,093,493,858.88 ch | 230,529,943,654.17 ch | 237,966,393,449.47 ch | 245,402,843,244.76 ch | 252,839,293,040.06 ch | 260,275,742,835.36 ch | 267,712,192,630.65 ch | 275,148,642,425.95 ch | 282,585,092,221.24 ch | 290,021,542,016.54 ch | 297,457,991,811.84 ch | 304,894,441,607.13 ch | 312,330,891,402.43 ch | 319,767,341,197.72 ch | 327,203,790,993.02 ch | 334,640,240,788.31 ch | 342,076,690,583.61 ch | 349,513,140,378.91 ch | 356,949,590,174.2 ch | 364,386,039,969.5 ch | 371,822,489,764.79 ch | 379,258,939,560.09 ch | 386,695,389,355.39 ch | 394,131,839,150.68 ch | 401,568,288,945.98 ch | 409,004,738,741.27 ch | 416,441,188,536.57 ch | 423,877,638,331.87 ch | 431,314,088,127.16 ch | 438,750,537,922.46 ch | 446,186,987,717.75 ch | 453,623,437,513.05 ch | 461,059,887,308.34 ch | 468,496,337,103.64 ch | 475,932,786,898.94 ch | 483,369,236,694.23 ch | 490,805,686,489.53 ch | 498,242,136,284.82 ch | 505,678,586,080.12 ch | 513,115,035,875.42 ch | 520,551,485,670.71 ch | 527,987,935,466.01 ch | 535,424,385,261.3 ch | 542,860,835,056.6 ch | 550,297,284,851.9 ch | 557,733,734,647.19 ch | 565,170,184,442.49 ch | 572,606,634,237.78 ch | 580,043,084,033.08 ch | 587,479,533,828.37 ch | 594,915,983,623.67 ch | 602,352,433,418.97 ch | 609,788,883,214.26 ch | 617,225,333,009.56 ch | 624,661,782,804.85 ch | 632,098,232,600.15 ch | 639,534,682,395.45 ch | 646,971,132,190.74 ch | 654,407,581,986.04 ch | 661,844,031,781.33 ch | 669,280,481,576.63 ch | 676,716,931,371.93 ch | 684,153,381,167.22 ch | 691,589,830,962.52 ch | 699,026,280,757.81 ch | 706,462,730,553.11 ch | 713,899,180,348.4 ch | 721,335,630,143.7 ch | 728 772 079 939 ch | 736,208,529,734.29 ch | 743,644,979,529.59 ch |
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 | chains | astronomical units | chains |
|---|---|---|---|
| 1 | ≈ 7436449795.2959 | 4 | ≈ 29745799181.184 |
| 1.5 | ≈ 11154674692.944 | 4.5 | ≈ 33464024078.831 |
| 2 | ≈ 14872899590.592 | 5 | ≈ 37182248976.479 |
| 2.5 | ≈ 18591124488.24 | 5.5 | ≈ 40900473874.127 |
| 3 | ≈ 22309349385.888 | 6 | ≈ 44618698771.775 |
A chain is a unit of length. It measures 66 feet, or 22 yards, or 100 links, or 4 rods (20.1168 m). There are 10 chains in a furlong, and 80 chains in one statute mile. An acre is the area of 10 square chains (that is, an area of one chain by one furlong). The chain has been used for several centuries in Britain and in some other countries influenced by British practice.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| chain | ch | ≡ 66 ft (US) ≡ 4 rods | ≈ 20.11684 m | Imperial/US |
| chains | astronomical units | chains | astronomical units |
|---|---|---|---|
| 1 | ≈ 1.3447276960473E-10 | 4 | ≈ 5.3789107841894E-10 |
| 1.5 | ≈ 2.017091544071E-10 | 4.5 | ≈ 6.0512746322131E-10 |
| 2 | ≈ 2.6894553920947E-10 | 5 | ≈ 6.7236384802367E-10 |
| 2.5 | ≈ 3.3618192401184E-10 | 5.5 | ≈ 7.3960023282604E-10 |
| 3 | ≈ 4.034183088142E-10 | 6 | ≈ 8.0683661762841E-10 |
| astronomical units | chains |
|---|---|
| 1 | ≈ 7,436,449,795.2959 |
| 1.3447276960473 × 10-10 | ≈ 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 …) |