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 yd = 9.6649e-17 ly
1 ly = 10,346,675,415,573,054 yd
例子:
将15 院子转换为光明年：
15 yd = 1.4497e-15 ly
| 院子 | 光明年 |
|---|---|
| 0.01 yd | 9.6649e-19 ly |
| 0.1 yd | 9.6649e-18 ly |
| 1 yd | 9.6649e-17 ly |
| 2 yd | 1.9330e-16 ly |
| 3 yd | 2.8995e-16 ly |
| 5 yd | 4.8325e-16 ly |
| 10 yd | 9.6649e-16 ly |
| 20 yd | 1.9330e-15 ly |
| 30 yd | 2.8995e-15 ly |
| 40 yd | 3.8660e-15 ly |
| 50 yd | 4.8325e-15 ly |
| 60 yd | 5.7990e-15 ly |
| 70 yd | 6.7655e-15 ly |
| 80 yd | 7.7320e-15 ly |
| 90 yd | 8.6984e-15 ly |
| 100 yd | 9.6649e-15 ly |
| 250 yd | 2.4162e-14 ly |
| 500 yd | 4.8325e-14 ly |
| 750 yd | 7.2487e-14 ly |
| 1000 yd | 9.6649e-14 ly |
| 10000 yd | 9.6649e-13 ly |
| 100000 yd | 9.6649e-12 ly |
规则