| fathom | 1 ftm | 2 ftm | 3 ftm | 4 ftm | 5 ftm | 6 ftm | 7 ftm | 8 ftm | 9 ftm | 10 ftm | 11 ftm | 12 ftm | 13 ftm | 14 ftm | 15 ftm | 16 ftm | 17 ftm | 18 ftm | 19 ftm | 20 ftm | 21 ftm | 22 ftm | 23 ftm | 24 ftm | 25 ftm | 26 ftm | 27 ftm | 28 ftm | 29 ftm | 30 ftm | 31 ftm | 32 ftm | 33 ftm | 34 ftm | 35 ftm | 36 ftm | 37 ftm | 38 ftm | 39 ftm | 40 ftm | 41 ftm | 42 ftm | 43 ftm | 44 ftm | 45 ftm | 46 ftm | 47 ftm | 48 ftm | 49 ftm | 50 ftm | 51 ftm | 52 ftm | 53 ftm | 54 ftm | 55 ftm | 56 ftm | 57 ftm | 58 ftm | 59 ftm | 60 ftm | 61 ftm | 62 ftm | 63 ftm | 64 ftm | 65 ftm | 66 ftm | 67 ftm | 68 ftm | 69 ftm | 70 ftm | 71 ftm | 72 ftm | 73 ftm | 74 ftm | 75 ftm | 76 ftm | 77 ftm | 78 ftm | 79 ftm | 80 ftm | 81 ftm | 82 ftm | 83 ftm | 84 ftm | 85 ftm | 86 ftm | 87 ftm | 88 ftm | 89 ftm | 90 ftm | 91 ftm | 92 ftm | 93 ftm | 94 ftm | 95 ftm | 96 ftm | 97 ftm | 98 ftm | 99 ftm | 100 ftm |
| light-hour | 1.6945056036066 × 10-12 light-hour | 3.3890112072132 × 10-12 light-hour | 5.0835168108198 × 10-12 light-hour | 6.7780224144264 × 10-12 light-hour | 8.4725280180331 × 10-12 light-hour | 1.016703362164 × 10-11 light-hour | 1.1861539225246 × 10-11 light-hour | 1.3556044828853 × 10-11 light-hour | 1.525055043246 × 10-11 light-hour | 1.6945056036066 × 10-11 light-hour | 1.8639561639673 × 10-11 light-hour | 2.0334067243279 × 10-11 light-hour | 2.2028572846886 × 10-11 light-hour | 2.3723078450493 × 10-11 light-hour | 2.5417584054099 × 10-11 light-hour | 2.7112089657706 × 10-11 light-hour | 2.8806595261312 × 10-11 light-hour | 3.0501100864919 × 10-11 light-hour | 3.2195606468526 × 10-11 light-hour | 3.3890112072132 × 10-11 light-hour | 3.5584617675739 × 10-11 light-hour | 3.7279123279345 × 10-11 light-hour | 3.8973628882952 × 10-11 light-hour | 4.0668134486559 × 10-11 light-hour | 4.2362640090165 × 10-11 light-hour | 4.4057145693772 × 10-11 light-hour | 4.5751651297379 × 10-11 light-hour | 4.7446156900985 × 10-11 light-hour | 4.9140662504592 × 10-11 light-hour | 5.0835168108198 × 10-11 light-hour | 5.2529673711805 × 10-11 light-hour | 5.4224179315412 × 10-11 light-hour | 5.5918684919018 × 10-11 light-hour | 5.7613190522625 × 10-11 light-hour | 5.9307696126231 × 10-11 light-hour | 6.1002201729838 × 10-11 light-hour | 6.2696707333445 × 10-11 light-hour | 6.4391212937051 × 10-11 light-hour | 6.6085718540658 × 10-11 light-hour | 6.7780224144264 × 10-11 light-hour | 6.9474729747871 × 10-11 light-hour | 7.1169235351478 × 10-11 light-hour | 7.2863740955084 × 10-11 light-hour | 7.4558246558691 × 10-11 light-hour | 7.6252752162298 × 10-11 light-hour | 7.7947257765904 × 10-11 light-hour | 7.9641763369511 × 10-11 light-hour | 8.1336268973117 × 10-11 light-hour | 8.3030774576724 × 10-11 light-hour | 8.4725280180331 × 10-11 light-hour | 8.6419785783937 × 10-11 light-hour | 8.8114291387544 × 10-11 light-hour | 8.980879699115 × 10-11 light-hour | 9.1503302594757 × 10-11 light-hour | 9.3197808198364 × 10-11 light-hour | 9.489231380197 × 10-11 light-hour | 9.6586819405577 × 10-11 light-hour | 9.8281325009184 × 10-11 light-hour | 9.997583061279 × 10-11 light-hour | 1.016703362164 × 10-10 light-hour | 1.0336484182 × 10-10 light-hour | 1.0505934742361 × 10-10 light-hour | 1.0675385302722 × 10-10 light-hour | 1.0844835863082 × 10-10 light-hour | 1.1014286423443 × 10-10 light-hour | 1.1183736983804 × 10-10 light-hour | 1.1353187544164 × 10-10 light-hour | 1.1522638104525 × 10-10 light-hour | 1.1692088664886 × 10-10 light-hour | 1.1861539225246 × 10-10 light-hour | 1.2030989785607 × 10-10 light-hour | 1.2200440345968 × 10-10 light-hour | 1.2369890906328 × 10-10 light-hour | 1.2539341466689 × 10-10 light-hour | 1.270879202705 × 10-10 light-hour | 1.287824258741 × 10-10 light-hour | 1.3047693147771 × 10-10 light-hour | 1.3217143708132 × 10-10 light-hour | 1.3386594268492 × 10-10 light-hour | 1.3556044828853 × 10-10 light-hour | 1.3725495389214 × 10-10 light-hour | 1.3894945949574 × 10-10 light-hour | 1.4064396509935 × 10-10 light-hour | 1.4233847070296 × 10-10 light-hour | 1.4403297630656 × 10-10 light-hour | 1.4572748191017 × 10-10 light-hour | 1.4742198751378 × 10-10 light-hour | 1.4911649311738 × 10-10 light-hour | 1.5081099872099 × 10-10 light-hour | 1.525055043246 × 10-10 light-hour | 1.542000099282 × 10-10 light-hour | 1.5589451553181 × 10-10 light-hour | 1.5758902113541 × 10-10 light-hour | 1.5928352673902 × 10-10 light-hour | 1.6097803234263 × 10-10 light-hour | 1.6267253794623 × 10-10 light-hour | 1.6436704354984 × 10-10 light-hour | 1.6606154915345 × 10-10 light-hour | 1.6775605475705 × 10-10 light-hour | 1.6945056036066 × 10-10 light-hour |
A fathom is a unit of length in the imperial and the U.S. customary systems equal to 6 feet (1.8288 metres), used especially for measuring the depth of water.
There are two yards (6 feet) in an imperial fathom. Originally the span of a man's outstretched arms, the size of a fathom has varied slightly depending on whether it was defined as a thousandth of an (Admiralty) nautical mile or as a multiple of the imperial yard. Formerly, the term was used for any of several units of length varying around 5–5 1⁄2 feet.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| fathom | ftm | ≡ 6 ft | = 1.8288 m | Imperial/US |
| fathoms | light-hours | fathoms | light-hours |
|---|---|---|---|
| 1 | = 1.6945056036066E-12 | 4 | = 6.7780224144264E-12 |
| 1.5 | = 2.5417584054099E-12 | 4.5 | = 7.6252752162298E-12 |
| 2 | = 3.3890112072132E-12 | 5 | = 8.4725280180331E-12 |
| 2.5 | = 4.2362640090165E-12 | 5.5 | = 9.3197808198364E-12 |
| 3 | = 5.0835168108198E-12 | 6 | = 1.016703362164E-11 |
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 | fathoms | light-hours | fathoms |
|---|---|---|---|
| 1 | = 590142633858.27 | 4 | = 2360570535433.1 |
| 1.5 | = 885213950787.4 | 4.5 | = 2655641852362.2 |
| 2 | = 1180285267716.5 | 5 | = 2950713169291.3 |
| 2.5 | = 1475356584645.7 | 5.5 | = 3245784486220.5 |
| 3 | = 1770427901574.8 | 6 | = 3540855803149.6 |
| fathoms | light-hours |
|---|---|
| 1 | = 1.6945056036066 × 10-12 |
| 590,142,633,858.27 | = 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 …) |