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 |
parsec | 4.8481368110954 × 10-6 pc | 9.6962736221907 × 10-6 pc | 1.4544410433286 × 10-5 pc | 1.9392547244381 × 10-5 pc | 2.4240684055477 × 10-5 pc | 2.9088820866572 × 10-5 pc | 3.3936957677667 × 10-5 pc | 3.8785094488763 × 10-5 pc | 4.3633231299858 × 10-5 pc | 4.8481368110954 × 10-5 pc | 5.3329504922049 × 10-5 pc | 5.8177641733144 × 10-5 pc | 6.302577854424 × 10-5 pc | 6.7873915355335 × 10-5 pc | 7.272205216643 × 10-5 pc | 7.7570188977526 × 10-5 pc | 8.2418325788621 × 10-5 pc | 8.7266462599716 × 10-5 pc | 9.2114599410812 × 10-5 pc | 9.6962736221907 × 10-5 pc | 0.0001018 pc | 0.0001067 pc | 0.0001115 pc | 0.0001164 pc | 0.0001212 pc | 0.0001261 pc | 0.0001309 pc | 0.0001357 pc | 0.0001406 pc | 0.0001454 pc | 0.0001503 pc | 0.0001551 pc | 0.0001600 pc | 0.0001648 pc | 0.0001697 pc | 0.0001745 pc | 0.0001794 pc | 0.0001842 pc | 0.0001891 pc | 0.0001939 pc | 0.0001988 pc | 0.0002036 pc | 0.0002085 pc | 0.0002133 pc | 0.0002182 pc | 0.0002230 pc | 0.0002279 pc | 0.0002327 pc | 0.0002376 pc | 0.0002424 pc | 0.0002473 pc | 0.0002521 pc | 0.0002570 pc | 0.0002618 pc | 0.0002666 pc | 0.0002715 pc | 0.0002763 pc | 0.0002812 pc | 0.0002860 pc | 0.0002909 pc | 0.0002957 pc | 0.0003006 pc | 0.0003054 pc | 0.0003103 pc | 0.0003151 pc | 0.0003200 pc | 0.0003248 pc | 0.0003297 pc | 0.0003345 pc | 0.0003394 pc | 0.0003442 pc | 0.0003491 pc | 0.0003539 pc | 0.0003588 pc | 0.0003636 pc | 0.0003685 pc | 0.0003733 pc | 0.0003782 pc | 0.0003830 pc | 0.0003879 pc | 0.0003927 pc | 0.0003975 pc | 0.0004024 pc | 0.0004072 pc | 0.0004121 pc | 0.0004169 pc | 0.0004218 pc | 0.0004266 pc | 0.0004315 pc | 0.0004363 pc | 0.0004412 pc | 0.0004460 pc | 0.0004509 pc | 0.0004557 pc | 0.0004606 pc | 0.0004654 pc | 0.0004703 pc | 0.0004751 pc | 0.0004800 pc | 0.0004848 pc |
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 |
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 |
astronomical units | parsecs |
---|---|
1 | ≈ 4.8481368110954 × 10-6 |
206,264.8062471 | ≈ 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 …) |