长度是一个基本的物理量，可测量两个点之间的距离。它是国际单元（SI）中的七个基本单元之一，仪表（m）是其基本单元。
1 ly = 470,303,427,980,593.3 ch
1 ch = 2.1263e-15 ly
例子:
将15 光明年转换为链：
15 ly = 7,054,551,419,708,900 ch
| 光明年 | 链 |
|---|---|
| 0.01 ly | 4,703,034,279,805.934 ch |
| 0.1 ly | 47,030,342,798,059.336 ch |
| 1 ly | 470,303,427,980,593.3 ch |
| 2 ly | 940,606,855,961,186.6 ch |
| 3 ly | 1,410,910,283,941,780 ch |
| 5 ly | 2,351,517,139,902,966.5 ch |
| 10 ly | 4,703,034,279,805,933 ch |
| 20 ly | 9,406,068,559,611,866 ch |
| 30 ly | 14,109,102,839,417,800 ch |
| 40 ly | 18,812,137,119,223,732 ch |
| 50 ly | 23,515,171,399,029,664 ch |
| 60 ly | 28,218,205,678,835,600 ch |
| 70 ly | 32,921,239,958,641,532 ch |
| 80 ly | 37,624,274,238,447,464 ch |
| 90 ly | 42,327,308,518,253,400 ch |
| 100 ly | 47,030,342,798,059,330 ch |
| 250 ly | 117,575,856,995,148,340 ch |
| 500 ly | 235,151,713,990,296,670 ch |
| 750 ly | 352,727,570,985,445,000 ch |
| 1000 ly | 470,303,427,980,593,340 ch |
| 10000 ly | 4,703,034,279,805,934,000 ch |
| 100000 ly | 47,030,342,798,059,330,000 ch |
规则