light-year | 1 ly | 2 ly | 3 ly | 4 ly | 5 ly | 6 ly | 7 ly | 8 ly | 9 ly | 10 ly | 11 ly | 12 ly | 13 ly | 14 ly | 15 ly | 16 ly | 17 ly | 18 ly | 19 ly | 20 ly | 21 ly | 22 ly | 23 ly | 24 ly | 25 ly | 26 ly | 27 ly | 28 ly | 29 ly | 30 ly | 31 ly | 32 ly | 33 ly | 34 ly | 35 ly | 36 ly | 37 ly | 38 ly | 39 ly | 40 ly | 41 ly | 42 ly | 43 ly | 44 ly | 45 ly | 46 ly | 47 ly | 48 ly | 49 ly | 50 ly | 51 ly | 52 ly | 53 ly | 54 ly | 55 ly | 56 ly | 57 ly | 58 ly | 59 ly | 60 ly | 61 ly | 62 ly | 63 ly | 64 ly | 65 ly | 66 ly | 67 ly | 68 ly | 69 ly | 70 ly | 71 ly | 72 ly | 73 ly | 74 ly | 75 ly | 76 ly | 77 ly | 78 ly | 79 ly | 80 ly | 81 ly | 82 ly | 83 ly | 84 ly | 85 ly | 86 ly | 87 ly | 88 ly | 89 ly | 90 ly | 91 ly | 92 ly | 93 ly | 94 ly | 95 ly | 96 ly | 97 ly | 98 ly | 99 ly | 100 ly |
earth radius | 1,484,936,180.3295 R⊕ | 2,969,872,360.659 R⊕ | 4,454,808,540.9886 R⊕ | 5,939,744,721.3181 R⊕ | 7,424,680,901.6476 R⊕ | 8,909,617,081.9771 R⊕ | 10,394,553,262.307 R⊕ | 11,879,489,442.636 R⊕ | 13,364,425,622.966 R⊕ | 14,849,361,803.295 R⊕ | 16,334,297,983.625 R⊕ | 17,819,234,163.954 R⊕ | 19,304,170,344.284 R⊕ | 20,789,106,524.613 R⊕ | 22,274,042,704.943 R⊕ | 23,758,978,885.272 R⊕ | 25,243,915,065.602 R⊕ | 26,728,851,245.931 R⊕ | 28,213,787,426.261 R⊕ | 29,698,723,606.59 R⊕ | 31,183,659,786.92 R⊕ | 32,668,595,967.25 R⊕ | 34,153,532,147.579 R⊕ | 35,638,468,327.909 R⊕ | 37,123,404,508.238 R⊕ | 38,608,340,688.568 R⊕ | 40,093,276,868.897 R⊕ | 41,578,213,049.227 R⊕ | 43,063,149,229.556 R⊕ | 44,548,085,409.886 R⊕ | 46,033,021,590.215 R⊕ | 47,517,957,770.545 R⊕ | 49,002,893,950.874 R⊕ | 50,487,830,131.204 R⊕ | 51,972,766,311.533 R⊕ | 53,457,702,491.863 R⊕ | 54,942,638,672.192 R⊕ | 56,427,574,852.522 R⊕ | 57,912,511,032.851 R⊕ | 59,397,447,213.181 R⊕ | 60,882,383,393.511 R⊕ | 62,367,319,573.84 R⊕ | 63,852,255,754.17 R⊕ | 65,337,191,934.499 R⊕ | 66,822,128,114.829 R⊕ | 68,307,064,295.158 R⊕ | 69,792,000,475.488 R⊕ | 71,276,936,655.817 R⊕ | 72,761,872,836.147 R⊕ | 74,246,809,016.476 R⊕ | 75,731,745,196.806 R⊕ | 77,216,681,377.135 R⊕ | 78,701,617,557.465 R⊕ | 80,186,553,737.794 R⊕ | 81,671,489,918.124 R⊕ | 83,156,426,098.453 R⊕ | 84,641,362,278.783 R⊕ | 86,126,298,459.112 R⊕ | 87,611,234,639.442 R⊕ | 89,096,170,819.771 R⊕ | 90,581,107,000.101 R⊕ | 92,066,043,180.431 R⊕ | 93,550,979,360.76 R⊕ | 95,035,915,541.09 R⊕ | 96,520,851,721.419 R⊕ | 98,005,787,901.749 R⊕ | 99,490,724,082.078 R⊕ | 100,975,660,262.41 R⊕ | 102,460,596,442.74 R⊕ | 103,945,532,623.07 R⊕ | 105,430,468,803.4 R⊕ | 106,915,404,983.73 R⊕ | 108,400,341,164.06 R⊕ | 109,885,277,344.38 R⊕ | 111,370,213,524.71 R⊕ | 112,855,149,705.04 R⊕ | 114,340,085,885.37 R⊕ | 115,825,022,065.7 R⊕ | 117,309,958,246.03 R⊕ | 118,794,894,426.36 R⊕ | 120,279,830,606.69 R⊕ | 121,764,766,787.02 R⊕ | 123,249,702,967.35 R⊕ | 124,734,639,147.68 R⊕ | 126,219,575,328.01 R⊕ | 127,704,511,508.34 R⊕ | 129,189,447,688.67 R⊕ | 130 674 383 869 R⊕ | 132,159,320,049.33 R⊕ | 133,644,256,229.66 R⊕ | 135,129,192,409.99 R⊕ | 136,614,128,590.32 R⊕ | 138,099,064,770.65 R⊕ | 139,584,000,950.98 R⊕ | 141,068,937,131.3 R⊕ | 142,553,873,311.63 R⊕ | 144,038,809,491.96 R⊕ | 145,523,745,672.29 R⊕ | 147,008,681,852.62 R⊕ | 148,493,618,032.95 R⊕ |
The light-year is a unit of length used to express astronomical distances. It is about 9.5 quadrillion metres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
light-year | ly | ≡ Distance light travels in vacuum in 365.25 days | = 9.4607304725808×1015 m | Science - Astronomy (Length) |
light-years | earth radius | light-years | earth radius |
---|---|---|---|
1 | ≈ 1484936180.3295 | 4 | ≈ 5939744721.3181 |
1.5 | ≈ 2227404270.4943 | 4.5 | ≈ 6682212811.4829 |
2 | ≈ 2969872360.659 | 5 | ≈ 7424680901.6476 |
2.5 | ≈ 3712340450.8238 | 5.5 | ≈ 8167148991.8124 |
3 | ≈ 4454808540.9886 | 6 | ≈ 8909617081.9771 |
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 | light-years | earth radius | light-years |
---|---|---|---|
1 | ≈ 6.734296148526E-10 | 4 | ≈ 2.6937184594104E-9 |
1.5 | ≈ 1.0101444222789E-9 | 4.5 | ≈ 3.0304332668367E-9 |
2 | ≈ 1.3468592297052E-9 | 5 | ≈ 3.367148074263E-9 |
2.5 | ≈ 1.6835740371315E-9 | 5.5 | ≈ 3.7038628816893E-9 |
3 | ≈ 2.0202888445578E-9 | 6 | ≈ 4.0405776891156E-9 |
light-years | earth radius |
---|---|
1 | ≈ 1,484,936,180.3295 |
6.734296148526 × 10-10 | ≈ 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 …) |