| parsec | 1 pc | 2 pc | 3 pc | 4 pc | 5 pc | 6 pc | 7 pc | 8 pc | 9 pc | 10 pc | 11 pc | 12 pc | 13 pc | 14 pc | 15 pc | 16 pc | 17 pc | 18 pc | 19 pc | 20 pc | 21 pc | 22 pc | 23 pc | 24 pc | 25 pc | 26 pc | 27 pc | 28 pc | 29 pc | 30 pc | 31 pc | 32 pc | 33 pc | 34 pc | 35 pc | 36 pc | 37 pc | 38 pc | 39 pc | 40 pc | 41 pc | 42 pc | 43 pc | 44 pc | 45 pc | 46 pc | 47 pc | 48 pc | 49 pc | 50 pc | 51 pc | 52 pc | 53 pc | 54 pc | 55 pc | 56 pc | 57 pc | 58 pc | 59 pc | 60 pc | 61 pc | 62 pc | 63 pc | 64 pc | 65 pc | 66 pc | 67 pc | 68 pc | 69 pc | 70 pc | 71 pc | 72 pc | 73 pc | 74 pc | 75 pc | 76 pc | 77 pc | 78 pc | 79 pc | 80 pc | 81 pc | 82 pc | 83 pc | 84 pc | 85 pc | 86 pc | 87 pc | 88 pc | 89 pc | 90 pc | 91 pc | 92 pc | 93 pc | 94 pc | 95 pc | 96 pc | 97 pc | 98 pc | 99 pc | 100 pc |
| astronomical unit | 206,264.8062471 AU | 412,529.6124942 AU | 618,794.4187413 AU | 825,059.2249884 AU | 1,031,324.0312355 AU | 1,237,588.8374826 AU | 1,443,853.6437297 AU | 1,650,118.4499768 AU | 1,856,383.2562239 AU | 2,062,648.062471 AU | 2,268,912.8687181 AU | 2,475,177.6749652 AU | 2,681,442.4812123 AU | 2,887,707.2874594 AU | 3,093,972.0937064 AU | 3,300,236.8999535 AU | 3,506,501.7062006 AU | 3,712,766.5124477 AU | 3,919,031.3186948 AU | 4,125,296.1249419 AU | 4,331,560.931189 AU | 4,537,825.7374361 AU | 4,744,090.5436832 AU | 4,950,355.3499303 AU | 5,156,620.1561774 AU | 5,362,884.9624245 AU | 5,569,149.7686716 AU | 5,775,414.5749187 AU | 5,981,679.3811658 AU | 6,187,944.1874129 AU | 6,394,208.99366 AU | 6,600,473.7999071 AU | 6,806,738.6061542 AU | 7,013,003.4124013 AU | 7,219,268.2186484 AU | 7,425,533.0248955 AU | 7,631,797.8311426 AU | 7,838,062.6373897 AU | 8,044,327.4436368 AU | 8,250,592.2498839 AU | 8,456,857.056131 AU | 8,663,121.8623781 AU | 8,869,386.6686252 AU | 9,075,651.4748722 AU | 9,281,916.2811193 AU | 9,488,181.0873664 AU | 9,694,445.8936135 AU | 9,900,710.6998606 AU | 10,106,975.506108 AU | 10,313,240.312355 AU | 10,519,505.118602 AU | 10,725,769.924849 AU | 10,932,034.731096 AU | 11,138,299.537343 AU | 11,344,564.34359 AU | 11,550,829.149837 AU | 11,757,093.956085 AU | 11,963,358.762332 AU | 12,169,623.568579 AU | 12,375,888.374826 AU | 12,582,153.181073 AU | 12,788,417.98732 AU | 12,994,682.793567 AU | 13,200,947.599814 AU | 13,407,212.406061 AU | 13,613,477.212308 AU | 13,819,742.018555 AU | 14,026,006.824803 AU | 14,232,271.63105 AU | 14,438,536.437297 AU | 14,644,801.243544 AU | 14,851,066.049791 AU | 15,057,330.856038 AU | 15,263,595.662285 AU | 15,469,860.468532 AU | 15,676,125.274779 AU | 15,882,390.081026 AU | 16,088,654.887274 AU | 16,294,919.693521 AU | 16,501,184.499768 AU | 16,707,449.306015 AU | 16,913,714.112262 AU | 17,119,978.918509 AU | 17,326,243.724756 AU | 17,532,508.531003 AU | 17,738,773.33725 AU | 17,945,038.143497 AU | 18,151,302.949744 AU | 18,357,567.755992 AU | 18,563,832.562239 AU | 18,770,097.368486 AU | 18,976,362.174733 AU | 19,182,626.98098 AU | 19,388,891.787227 AU | 19,595,156.593474 AU | 19,801,421.399721 AU | 20,007,686.205968 AU | 20,213,951.012215 AU | 20,420,215.818463 AU | 20,626,480.62471 AU |
The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| parsec | pc | Distant point with a parallax shift of one arc second from a base of one astronomical unit. | ≈ 30 856 775 814 913 700 m | Science - Astronomy (Length) |
| parsecs | astronomical units | parsecs | astronomical units |
|---|---|---|---|
| 1 | ≈ 206264.8062471 | 4 | ≈ 825059.22498839 |
| 1.5 | ≈ 309397.20937064 | 4.5 | ≈ 928191.62811193 |
| 2 | ≈ 412529.61249419 | 5 | ≈ 1031324.0312355 |
| 2.5 | ≈ 515662.01561774 | 5.5 | ≈ 1134456.434359 |
| 3 | ≈ 618794.41874129 | 6 | ≈ 1237588.8374826 |
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 | parsecs | astronomical units | parsecs |
|---|---|---|---|
| 1 | ≈ 4.8481368110954E-6 | 4 | ≈ 1.9392547244381E-5 |
| 1.5 | ≈ 7.272205216643E-6 | 4.5 | ≈ 2.1816615649929E-5 |
| 2 | ≈ 9.6962736221907E-6 | 5 | ≈ 2.4240684055477E-5 |
| 2.5 | ≈ 1.2120342027738E-5 | 5.5 | ≈ 2.6664752461024E-5 |
| 3 | ≈ 1.4544410433286E-5 | 6 | ≈ 2.9088820866572E-5 |
| parsecs | astronomical units |
|---|---|
| 1 | ≈ 206,264.8062471 |
| 4.8481368110954 × 10-6 | ≈ 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 …) |