| 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 |
| meter | 299 792 458 m | 599 584 916 m | 899 377 374 m | 1 199 169 832 m | 1 498 962 290 m | 1 798 754 748 m | 2 098 547 206 m | 2 398 339 664 m | 2 698 132 122 m | 2 997 924 580 m | 3 297 717 038 m | 3 597 509 496 m | 3 897 301 954 m | 4 197 094 412 m | 4 496 886 870 m | 4 796 679 328 m | 5 096 471 786 m | 5 396 264 244 m | 5 696 056 702 m | 5 995 849 160 m | 6 295 641 618 m | 6 595 434 076 m | 6 895 226 534 m | 7 195 018 992 m | 7 494 811 450 m | 7 794 603 908 m | 8 094 396 366 m | 8 394 188 824 m | 8 693 981 282 m | 8 993 773 740 m | 9 293 566 198 m | 9 593 358 656 m | 9 893 151 114 m | 10 192 943 572 m | 10 492 736 030 m | 10 792 528 488 m | 11 092 320 946 m | 11 392 113 404 m | 11 691 905 862 m | 11 991 698 320 m | 12 291 490 778 m | 12 591 283 236 m | 12 891 075 694 m | 13 190 868 152 m | 13 490 660 610 m | 13 790 453 068 m | 14 090 245 526 m | 14 390 037 984 m | 14 689 830 442 m | 14 989 622 900 m | 15 289 415 358 m | 15 589 207 816 m | 15 889 000 274 m | 16 188 792 732 m | 16 488 585 190 m | 16 788 377 648 m | 17 088 170 106 m | 17 387 962 564 m | 17 687 755 022 m | 17 987 547 480 m | 18 287 339 938 m | 18 587 132 396 m | 18 886 924 854 m | 19 186 717 312 m | 19 486 509 770 m | 19 786 302 228 m | 20 086 094 686 m | 20 385 887 144 m | 20 685 679 602 m | 20 985 472 060 m | 21 285 264 518 m | 21 585 056 976 m | 21 884 849 434 m | 22 184 641 892 m | 22 484 434 350 m | 22 784 226 808 m | 23 084 019 266 m | 23 383 811 724 m | 23 683 604 182 m | 23 983 396 640 m | 24 283 189 098 m | 24 582 981 556 m | 24 882 774 014 m | 25 182 566 472 m | 25 482 358 930 m | 25 782 151 388 m | 26 081 943 846 m | 26 381 736 304 m | 26 681 528 762 m | 26 981 321 220 m | 27 281 113 678 m | 27 580 906 136 m | 27 880 698 594 m | 28 180 491 052 m | 28 480 283 510 m | 28 780 075 968 m | 29 079 868 426 m | 29 379 660 884 m | 29 679 453 342 m | 29 979 245 800 m |
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 | meters | light-seconds | meters |
|---|---|---|---|
| 1 | ≡ 299792458 | 4 | ≡ 1199169832 |
| 1.5 | ≡ 449688687 | 4.5 | ≡ 1349066061 |
| 2 | ≡ 599584916 | 5 | ≡ 1498962290 |
| 2.5 | ≡ 749481145 | 5.5 | ≡ 1648858519 |
| 3 | ≡ 899377374 | 6 | ≡ 1798754748 |
The metre (international spelling) or meter (American spelling) (from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m. The metre is defined as the length of the path travelled by light in a vacuum in 1/299 792 458 seconds.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| meter | m | ≡ Distance light travels in 1⁄299792458 of a second in vacuum. | ≡ 1 m | Metric system SI |
| meters | light-seconds | meters | light-seconds |
|---|---|---|---|
| 1 | ≡ 3.3356409519815E-9 | 4 | ≡ 1.3342563807926E-8 |
| 1.5 | ≡ 5.0034614279723E-9 | 4.5 | ≡ 1.5010384283917E-8 |
| 2 | ≡ 6.671281903963E-9 | 5 | ≡ 1.6678204759908E-8 |
| 2.5 | ≡ 8.3391023799538E-9 | 5.5 | ≡ 1.8346025235898E-8 |
| 3 | ≡ 1.0006922855945E-8 | 6 | ≡ 2.0013845711889E-8 |
| light-seconds | meters |
|---|---|
| 1 | ≡ 299 792 458 |
| 3.3356409519815 × 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 …) |