| light-hour | 1 light-hour | 2 light-hour | 3 light-hour | 4 light-hour | 5 light-hour | 6 light-hour | 7 light-hour | 8 light-hour | 9 light-hour | 10 light-hour | 11 light-hour | 12 light-hour | 13 light-hour | 14 light-hour | 15 light-hour | 16 light-hour | 17 light-hour | 18 light-hour | 19 light-hour | 20 light-hour | 21 light-hour | 22 light-hour | 23 light-hour | 24 light-hour | 25 light-hour | 26 light-hour | 27 light-hour | 28 light-hour | 29 light-hour | 30 light-hour | 31 light-hour | 32 light-hour | 33 light-hour | 34 light-hour | 35 light-hour | 36 light-hour | 37 light-hour | 38 light-hour | 39 light-hour | 40 light-hour | 41 light-hour | 42 light-hour | 43 light-hour | 44 light-hour | 45 light-hour | 46 light-hour | 47 light-hour | 48 light-hour | 49 light-hour | 50 light-hour | 51 light-hour | 52 light-hour | 53 light-hour | 54 light-hour | 55 light-hour | 56 light-hour | 57 light-hour | 58 light-hour | 59 light-hour | 60 light-hour | 61 light-hour | 62 light-hour | 63 light-hour | 64 light-hour | 65 light-hour | 66 light-hour | 67 light-hour | 68 light-hour | 69 light-hour | 70 light-hour | 71 light-hour | 72 light-hour | 73 light-hour | 74 light-hour | 75 light-hour | 76 light-hour | 77 light-hour | 78 light-hour | 79 light-hour | 80 light-hour | 81 light-hour | 82 light-hour | 83 light-hour | 84 light-hour | 85 light-hour | 86 light-hour | 87 light-hour | 88 light-hour | 89 light-hour | 90 light-hour | 91 light-hour | 92 light-hour | 93 light-hour | 94 light-hour | 95 light-hour | 96 light-hour | 97 light-hour | 98 light-hour | 99 light-hour | 100 light-hour |
| astronomical unit | 7.2143597 AU | 14.4287194 AU | 21.6430791 AU | 28.8574388 AU | 36.0717985 AU | 43.2861582 AU | 50.5005179 AU | 57.7148776 AU | 64.9292373 AU | 72.1435969 AU | 79.3579566 AU | 86.5723163 AU | 93.7866760 AU | 101.0010357 AU | 108.2153954 AU | 115.4297551 AU | 122.6441148 AU | 129.8584745 AU | 137.0728342 AU | 144.2871939 AU | 151.5015536 AU | 158.7159133 AU | 165.9302730 AU | 173.1446327 AU | 180.3589924 AU | 187.5733521 AU | 194.7877118 AU | 202.0020715 AU | 209.2164311 AU | 216.4307908 AU | 223.6451505 AU | 230.8595102 AU | 238.0738699 AU | 245.2882296 AU | 252.5025893 AU | 259.7169490 AU | 266.9313087 AU | 274.1456684 AU | 281.3600281 AU | 288.5743878 AU | 295.7887475 AU | 303.0031072 AU | 310.2174669 AU | 317.4318266 AU | 324.6461863 AU | 331.8605460 AU | 339.0749057 AU | 346.2892653 AU | 353.5036250 AU | 360.7179847 AU | 367.9323444 AU | 375.1467041 AU | 382.3610638 AU | 389.5754235 AU | 396.7897832 AU | 404.0041429 AU | 411.2185026 AU | 418.4328623 AU | 425.6472220 AU | 432.8615817 AU | 440.0759414 AU | 447.2903011 AU | 454.5046608 AU | 461.7190205 AU | 468.9333802 AU | 476.1477399 AU | 483.3620995 AU | 490.5764592 AU | 497.7908189 AU | 505.0051786 AU | 512.2195383 AU | 519.4338980 AU | 526.6482577 AU | 533.8626174 AU | 541.0769771 AU | 548.2913368 AU | 555.5056965 AU | 562.7200562 AU | 569.9344159 AU | 577.1487756 AU | 584.3631353 AU | 591.5774950 AU | 598.7918547 AU | 606.0062144 AU | 613.2205741 AU | 620.4349337 AU | 627.6492934 AU | 634.8636531 AU | 642.0780128 AU | 649.2923725 AU | 656.5067322 AU | 663.7210919 AU | 670.9354516 AU | 678.1498113 AU | 685.3641710 AU | 692.5785307 AU | 699.7928904 AU | 707.0072501 AU | 714.2216098 AU | 721.4359695 AU |
The light-hour is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in onehour, and is equal to exactly 1.0792528488×1012 metres.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| light-hour | ≡ 60 light-minutes | ≡ 1.0792528488×1012 m | Science - Astronomy (Length) |
| light-hours | astronomical units | light-hours | astronomical units |
|---|---|---|---|
| 1 | ≡ 7.21435969476 | 4 | ≡ 28.85743877904 |
| 1.5 | ≡ 10.82153954214 | 4.5 | ≡ 32.46461862642 |
| 2 | ≡ 14.42871938952 | 5 | ≡ 36.0717984738 |
| 2.5 | ≡ 18.0358992369 | 5.5 | ≡ 39.67897832118 |
| 3 | ≡ 21.64307908428 | 6 | ≡ 43.28615816856 |
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 | light-hours | astronomical units | light-hours |
|---|---|---|---|
| 1 | ≡ 0.13861243995449 | 4 | ≡ 0.55444975981795 |
| 1.5 | ≡ 0.20791865993173 | 4.5 | ≡ 0.6237559797952 |
| 2 | ≡ 0.27722487990898 | 5 | ≡ 0.69306219977244 |
| 2.5 | ≡ 0.34653109988622 | 5.5 | ≡ 0.76236841974968 |
| 3 | ≡ 0.41583731986346 | 6 | ≡ 0.83167463972693 |
| light-hours | astronomical units |
|---|---|
| 1 | ≡ 7.2143597 |
| 0.1386124 | ≡ 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 …) |