chain | 1 ch | 2 ch | 3 ch | 4 ch | 5 ch | 6 ch | 7 ch | 8 ch | 9 ch | 10 ch | 11 ch | 12 ch | 13 ch | 14 ch | 15 ch | 16 ch | 17 ch | 18 ch | 19 ch | 20 ch | 21 ch | 22 ch | 23 ch | 24 ch | 25 ch | 26 ch | 27 ch | 28 ch | 29 ch | 30 ch | 31 ch | 32 ch | 33 ch | 34 ch | 35 ch | 36 ch | 37 ch | 38 ch | 39 ch | 40 ch | 41 ch | 42 ch | 43 ch | 44 ch | 45 ch | 46 ch | 47 ch | 48 ch | 49 ch | 50 ch | 51 ch | 52 ch | 53 ch | 54 ch | 55 ch | 56 ch | 57 ch | 58 ch | 59 ch | 60 ch | 61 ch | 62 ch | 63 ch | 64 ch | 65 ch | 66 ch | 67 ch | 68 ch | 69 ch | 70 ch | 71 ch | 72 ch | 73 ch | 74 ch | 75 ch | 76 ch | 77 ch | 78 ch | 79 ch | 80 ch | 81 ch | 82 ch | 83 ch | 84 ch | 85 ch | 86 ch | 87 ch | 88 ch | 89 ch | 90 ch | 91 ch | 92 ch | 93 ch | 94 ch | 95 ch | 96 ch | 97 ch | 98 ch | 99 ch | 100 ch |
earth radius | 3.1575639617015 × 10-6R⊕ | 6.3151279234029 × 10-6R⊕ | 9.4726918851044 × 10-6R⊕ | 1.2630255846806 × 10-5R⊕ | 1.5787819808507 × 10-5R⊕ | 1.8945383770209 × 10-5R⊕ | 2.210294773191 × 10-5R⊕ | 2.5260511693612 × 10-5R⊕ | 2.8418075655313 × 10-5R⊕ | 3.1575639617015 × 10-5R⊕ | 3.4733203578716 × 10-5R⊕ | 3.7890767540418 × 10-5R⊕ | 4.1048331502119 × 10-5R⊕ | 4.420589546382 × 10-5R⊕ | 4.7363459425522 × 10-5R⊕ | 5.0521023387223 × 10-5R⊕ | 5.3678587348925 × 10-5R⊕ | 5.6836151310626 × 10-5R⊕ | 5.9993715272328 × 10-5R⊕ | 6.3151279234029 × 10-5R⊕ | 6.6308843195731 × 10-5R⊕ | 6.9466407157432 × 10-5R⊕ | 7.2623971119134 × 10-5R⊕ | 7.5781535080835 × 10-5R⊕ | 7.8939099042536 × 10-5R⊕ | 8.2096663004238 × 10-5R⊕ | 8.5254226965939 × 10-5R⊕ | 8.8411790927641 × 10-5R⊕ | 9.1569354889342 × 10-5R⊕ | 9.4726918851044 × 10-5R⊕ | 9.7884482812745 × 10-5R⊕ | 0.0001010 R⊕ | 0.0001042 R⊕ | 0.0001074 R⊕ | 0.0001105 R⊕ | 0.0001137 R⊕ | 0.0001168 R⊕ | 0.0001200 R⊕ | 0.0001231 R⊕ | 0.0001263 R⊕ | 0.0001295 R⊕ | 0.0001326 R⊕ | 0.0001358 R⊕ | 0.0001389 R⊕ | 0.0001421 R⊕ | 0.0001452 R⊕ | 0.0001484 R⊕ | 0.0001516 R⊕ | 0.0001547 R⊕ | 0.0001579 R⊕ | 0.0001610 R⊕ | 0.0001642 R⊕ | 0.0001674 R⊕ | 0.0001705 R⊕ | 0.0001737 R⊕ | 0.0001768 R⊕ | 0.0001800 R⊕ | 0.0001831 R⊕ | 0.0001863 R⊕ | 0.0001895 R⊕ | 0.0001926 R⊕ | 0.0001958 R⊕ | 0.0001989 R⊕ | 0.0002021 R⊕ | 0.0002052 R⊕ | 0.0002084 R⊕ | 0.0002116 R⊕ | 0.0002147 R⊕ | 0.0002179 R⊕ | 0.0002210 R⊕ | 0.0002242 R⊕ | 0.0002273 R⊕ | 0.0002305 R⊕ | 0.0002337 R⊕ | 0.0002368 R⊕ | 0.0002400 R⊕ | 0.0002431 R⊕ | 0.0002463 R⊕ | 0.0002494 R⊕ | 0.0002526 R⊕ | 0.0002558 R⊕ | 0.0002589 R⊕ | 0.0002621 R⊕ | 0.0002652 R⊕ | 0.0002684 R⊕ | 0.0002716 R⊕ | 0.0002747 R⊕ | 0.0002779 R⊕ | 0.0002810 R⊕ | 0.0002842 R⊕ | 0.0002873 R⊕ | 0.0002905 R⊕ | 0.0002937 R⊕ | 0.0002968 R⊕ | 0.0003000 R⊕ | 0.0003031 R⊕ | 0.0003063 R⊕ | 0.0003094 R⊕ | 0.0003126 R⊕ | 0.0003158 R⊕ |
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 | earth radius | chains | earth radius |
---|---|---|---|
1 | ≈ 3.1575639617015E-6 | 4 | ≈ 1.2630255846806E-5 |
1.5 | ≈ 4.7363459425522E-6 | 4.5 | ≈ 1.4209037827657E-5 |
2 | ≈ 6.3151279234029E-6 | 5 | ≈ 1.5787819808507E-5 |
2.5 | ≈ 7.8939099042536E-6 | 5.5 | ≈ 1.7366601789358E-5 |
3 | ≈ 9.4726918851044E-6 | 6 | ≈ 1.8945383770209E-5 |
Earth radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). This length is also used as a unit of distance, especially in astronomy and geology, where it is usually denoted by R⊕.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
earth radius | R⊕ | ≈ 6,371 km | ≈ 6,371 km | Science - Astronomy (Length) |
earth radius | chains | earth radius | chains |
---|---|---|---|
1 | ≈ 316699.83953742 | 4 | ≈ 1266799.3581497 |
1.5 | ≈ 475049.75930613 | 4.5 | ≈ 1425149.2779184 |
2 | ≈ 633399.67907484 | 5 | ≈ 1583499.1976871 |
2.5 | ≈ 791749.59884356 | 5.5 | ≈ 1741849.1174558 |
3 | ≈ 950099.51861227 | 6 | ≈ 1900199.0372245 |
chains | earth radius |
---|---|
1 | ≈ 3.1575639617015 × 10-6 |
316,699.8395374 | ≈ 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 …) |