| light-second | 1 light-second | 2 light-second | 3 light-second | 4 light-second | 5 light-second | 6 light-second | 7 light-second | 8 light-second | 9 light-second | 10 light-second | 11 light-second | 12 light-second | 13 light-second | 14 light-second | 15 light-second | 16 light-second | 17 light-second | 18 light-second | 19 light-second | 20 light-second | 21 light-second | 22 light-second | 23 light-second | 24 light-second | 25 light-second | 26 light-second | 27 light-second | 28 light-second | 29 light-second | 30 light-second | 31 light-second | 32 light-second | 33 light-second | 34 light-second | 35 light-second | 36 light-second | 37 light-second | 38 light-second | 39 light-second | 40 light-second | 41 light-second | 42 light-second | 43 light-second | 44 light-second | 45 light-second | 46 light-second | 47 light-second | 48 light-second | 49 light-second | 50 light-second | 51 light-second | 52 light-second | 53 light-second | 54 light-second | 55 light-second | 56 light-second | 57 light-second | 58 light-second | 59 light-second | 60 light-second | 61 light-second | 62 light-second | 63 light-second | 64 light-second | 65 light-second | 66 light-second | 67 light-second | 68 light-second | 69 light-second | 70 light-second | 71 light-second | 72 light-second | 73 light-second | 74 light-second | 75 light-second | 76 light-second | 77 light-second | 78 light-second | 79 light-second | 80 light-second | 81 light-second | 82 light-second | 83 light-second | 84 light-second | 85 light-second | 86 light-second | 87 light-second | 88 light-second | 89 light-second | 90 light-second | 91 light-second | 92 light-second | 93 light-second | 94 light-second | 95 light-second | 96 light-second | 97 light-second | 98 light-second | 99 light-second | 100 light-second |
| foot | 983,571,056.43045 ft | 1,967,142,112.8609 ft | 2,950,713,169.2913 ft | 3,934,284,225.7218 ft | 4,917,855,282.1522 ft | 5,901,426,338.5827 ft | 6,884,997,395.0131 ft | 7,868,568,451.4436 ft | 8,852,139,507.874 ft | 9,835,710,564.3045 ft | 10,819,281,620.735 ft | 11,802,852,677.165 ft | 12,786,423,733.596 ft | 13,769,994,790.026 ft | 14,753,565,846.457 ft | 15,737,136,902.887 ft | 16,720,707,959.318 ft | 17,704,279,015.748 ft | 18,687,850,072.178 ft | 19,671,421,128.609 ft | 20,654,992,185.039 ft | 21,638,563,241.47 ft | 22,622,134,297.9 ft | 23,605,705,354.331 ft | 24,589,276,410.761 ft | 25,572,847,467.192 ft | 26,556,418,523.622 ft | 27,539,989,580.052 ft | 28,523,560,636.483 ft | 29,507,131,692.913 ft | 30,490,702,749.344 ft | 31,474,273,805.774 ft | 32,457,844,862.205 ft | 33,441,415,918.635 ft | 34,424,986,975.066 ft | 35,408,558,031.496 ft | 36,392,129,087.927 ft | 37,375,700,144.357 ft | 38,359,271,200.787 ft | 39,342,842,257.218 ft | 40,326,413,313.648 ft | 41,309,984,370.079 ft | 42,293,555,426.509 ft | 43,277,126,482.94 ft | 44,260,697,539.37 ft | 45,244,268,595.801 ft | 46,227,839,652.231 ft | 47,211,410,708.661 ft | 48,194,981,765.092 ft | 49,178,552,821.522 ft | 50,162,123,877.953 ft | 51,145,694,934.383 ft | 52,129,265,990.814 ft | 53,112,837,047.244 ft | 54,096,408,103.675 ft | 55,079,979,160.105 ft | 56,063,550,216.535 ft | 57,047,121,272.966 ft | 58,030,692,329.396 ft | 59,014,263,385.827 ft | 59,997,834,442.257 ft | 60,981,405,498.688 ft | 61,964,976,555.118 ft | 62,948,547,611.549 ft | 63,932,118,667.979 ft | 64,915,689,724.409 ft | 65,899,260,780.84 ft | 66,882,831,837.27 ft | 67,866,402,893.701 ft | 68,849,973,950.131 ft | 69,833,545,006.562 ft | 70,817,116,062.992 ft | 71,800,687,119.423 ft | 72,784,258,175.853 ft | 73,767,829,232.283 ft | 74,751,400,288.714 ft | 75,734,971,345.144 ft | 76,718,542,401.575 ft | 77,702,113,458.005 ft | 78,685,684,514.436 ft | 79,669,255,570.866 ft | 80,652,826,627.297 ft | 81,636,397,683.727 ft | 82,619,968,740.157 ft | 83,603,539,796.588 ft | 84,587,110,853.018 ft | 85,570,681,909.449 ft | 86,554,252,965.879 ft | 87,537,824,022.31 ft | 88,521,395,078.74 ft | 89,504,966,135.171 ft | 90,488,537,191.601 ft | 91,472,108,248.031 ft | 92,455,679,304.462 ft | 93,439,250,360.892 ft | 94,422,821,417.323 ft | 95,406,392,473.753 ft | 96,389,963,530.184 ft | 97,373,534,586.614 ft | 98,357,105,643.045 ft |
The light-second 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 onesecond, and is equal to exactly 299792458 metres (just over 186282 miles).
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| light-second | ≡ Distance light travels in one second in vacuum | ≡ 299 792 458 m | Science - Astronomy (Length) |
| light-seconds | feet | light-seconds | feet |
|---|---|---|---|
| 1 | ≡ 983571056.43045 | 4 | ≡ 3934284225.7218 |
| 1.5 | ≡ 1475356584.6457 | 4.5 | ≡ 4426069753.937 |
| 2 | ≡ 1967142112.8609 | 5 | ≡ 4917855282.1522 |
| 2.5 | ≡ 2458927641.0761 | 5.5 | ≡ 5409640810.3675 |
| 3 | ≡ 2950713169.2913 | 6 | ≡ 5901426338.5827 |
The foot (pl. feet; abbreviation: ft; symbol: ′, the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| foot | ft | ≡ 0.3048 m ≡ 1⁄3 yd ≡ 12 inches | ≡ 0.3048 m | Imperial/US |
| feet | light-seconds | feet | light-seconds |
|---|---|---|---|
| 1 | ≡ 1.016703362164E-9 | 4 | ≡ 4.0668134486559E-9 |
| 1.5 | ≡ 1.525055043246E-9 | 4.5 | ≡ 4.5751651297379E-9 |
| 2 | ≡ 2.0334067243279E-9 | 5 | ≡ 5.0835168108198E-9 |
| 2.5 | ≡ 2.5417584054099E-9 | 5.5 | ≡ 5.5918684919018E-9 |
| 3 | ≡ 3.0501100864919E-9 | 6 | ≡ 6.1002201729838E-9 |
| light-seconds | feet |
|---|---|
| 1 | ≡ 983,571,056.43045 |
| 1.016703362164 × 10-9 | ≡ 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 …) |