light-day | 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 | 4,065,620.5260085 R⊕ | 8,131,241.052017 R⊕ | 12,196,861.578025 R⊕ | 16,262,482.104034 R⊕ | 20,328,102.630042 R⊕ | 24,393,723.156051 R⊕ | 28,459,343.682059 R⊕ | 32,524,964.208068 R⊕ | 36,590,584.734076 R⊕ | 40,656,205.260085 R⊕ | 44,721,825.786093 R⊕ | 48,787,446.312102 R⊕ | 52,853,066.83811 R⊕ | 56,918,687.364119 R⊕ | 60,984,307.890127 R⊕ | 65,049,928.416136 R⊕ | 69,115,548.942144 R⊕ | 73,181,169.468153 R⊕ | 77,246,789.994161 R⊕ | 81,312,410.52017 R⊕ | 85,378,031.046178 R⊕ | 89,443,651.572186 R⊕ | 93,509,272.098195 R⊕ | 97,574,892.624203 R⊕ | 101,640,513.15021 R⊕ | 105,706,133.67622 R⊕ | 109,771,754.20223 R⊕ | 113,837,374.72824 R⊕ | 117,902,995.25425 R⊕ | 121,968,615.78025 R⊕ | 126,034,236.30626 R⊕ | 130,099,856.83227 R⊕ | 134,165,477.35828 R⊕ | 138,231,097.88429 R⊕ | 142,296,718.4103 R⊕ | 146,362,338.93631 R⊕ | 150,427,959.46231 R⊕ | 154,493,579.98832 R⊕ | 158,559,200.51433 R⊕ | 162,624,821.04034 R⊕ | 166,690,441.56635 R⊕ | 170,756,062.09236 R⊕ | 174,821,682.61836 R⊕ | 178,887,303.14437 R⊕ | 182,952,923.67038 R⊕ | 187,018,544.19639 R⊕ | 191,084,164.7224 R⊕ | 195,149,785.24841 R⊕ | 199,215,405.77442 R⊕ | 203,281,026.30042 R⊕ | 207,346,646.82643 R⊕ | 211,412,267.35244 R⊕ | 215,477,887.87845 R⊕ | 219,543,508.40446 R⊕ | 223,609,128.93047 R⊕ | 227,674,749.45647 R⊕ | 231,740,369.98248 R⊕ | 235,805,990.50849 R⊕ | 239,871,611.0345 R⊕ | 243,937,231.56051 R⊕ | 248,002,852.08652 R⊕ | 252,068,472.61253 R⊕ | 256,134,093.13853 R⊕ | 260,199,713.66454 R⊕ | 264,265,334.19055 R⊕ | 268,330,954.71656 R⊕ | 272,396,575.24257 R⊕ | 276,462,195.76858 R⊕ | 280,527,816.29458 R⊕ | 284,593,436.82059 R⊕ | 288,659,057.3466 R⊕ | 292,724,677.87261 R⊕ | 296,790,298.39862 R⊕ | 300,855,918.92463 R⊕ | 304,921,539.45064 R⊕ | 308,987,159.97664 R⊕ | 313,052,780.50265 R⊕ | 317,118,401.02866 R⊕ | 321,184,021.55467 R⊕ | 325,249,642.08068 R⊕ | 329,315,262.60669 R⊕ | 333,380,883.1327 R⊕ | 337,446,503.6587 R⊕ | 341,512,124.18471 R⊕ | 345,577,744.71072 R⊕ | 349,643,365.23673 R⊕ | 353,708,985.76274 R⊕ | 357,774,606.28875 R⊕ | 361,840,226.81475 R⊕ | 365,905,847.34076 R⊕ | 369,971,467.86677 R⊕ | 374,037,088.39278 R⊕ | 378,102,708.91879 R⊕ | 382,168,329.4448 R⊕ | 386,233,949.97081 R⊕ | 390,299,570.49681 R⊕ | 394,365,191.02282 R⊕ | 398,430,811.54883 R⊕ | 402,496,432.07484 R⊕ | 406,562,052.60085 R⊕ |
The light-day 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 oneday, and is equal to exactly 2.59020683712×1013 metres.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
light-day | ly | ≡ 24 light-hours | ≡ 2.59020683712×1013 m | Science - Astronomy (Length) |
light-days | earth radius | light-days | earth radius |
---|---|---|---|
1 | ≈ 4065620.5260085 | 4 | ≈ 16262482.104034 |
1.5 | ≈ 6098430.7890127 | 4.5 | ≈ 18295292.367038 |
2 | ≈ 8131241.052017 | 5 | ≈ 20328102.630042 |
2.5 | ≈ 10164051.315021 | 5.5 | ≈ 22360912.893047 |
3 | ≈ 12196861.578025 | 6 | ≈ 24393723.156051 |
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-days | earth radius | light-days |
---|---|---|---|
1 | ≈ 2.4596491325317E-7 | 4 | ≈ 9.838596530127E-7 |
1.5 | ≈ 3.6894736987976E-7 | 4.5 | ≈ 1.1068421096393E-6 |
2 | ≈ 4.9192982650635E-7 | 5 | ≈ 1.2298245662659E-6 |
2.5 | ≈ 6.1491228313294E-7 | 5.5 | ≈ 1.3528070228925E-6 |
3 | ≈ 7.3789473975952E-7 | 6 | ≈ 1.475789479519E-6 |
light-days | earth radius |
---|---|
1 | ≈ 4,065,620.5260085 |
2.4596491325317 × 10-7 | ≈ 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 …) |