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 = 10,346,675,415,573,054 yd
1 yd = 9.6649e-17 ly
例子:
将15 光明年转换为院子：
15 ly = 155,200,131,233,595,800 yd
| 光明年 | 院子 |
|---|---|
| 0.01 ly | 103,466,754,155,730.55 yd |
| 0.1 ly | 1,034,667,541,557,305.5 yd |
| 1 ly | 10,346,675,415,573,054 yd |
| 2 ly | 20,693,350,831,146,108 yd |
| 3 ly | 31,040,026,246,719,160 yd |
| 5 ly | 51,733,377,077,865,270 yd |
| 10 ly | 103,466,754,155,730,540 yd |
| 20 ly | 206,933,508,311,461,100 yd |
| 30 ly | 310,400,262,467,191,600 yd |
| 40 ly | 413,867,016,622,922,200 yd |
| 50 ly | 517,333,770,778,652,700 yd |
| 60 ly | 620,800,524,934,383,200 yd |
| 70 ly | 724,267,279,090,113,800 yd |
| 80 ly | 827,734,033,245,844,400 yd |
| 90 ly | 931,200,787,401,574,900 yd |
| 100 ly | 1,034,667,541,557,305,300 yd |
| 250 ly | 2,586,668,853,893,263,400 yd |
| 500 ly | 5,173,337,707,786,527,000 yd |
| 750 ly | 7,760,006,561,679,790,000 yd |
| 1000 ly | 10,346,675,415,573,053,000 yd |
| 10000 ly | 103,466,754,155,730,530,000 yd |
| 100000 ly | 1,034,667,541,557,305,400,000 yd |
规则