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 = 31,040,026,246,719,160 ft
1 ft = 3.2216e-17 ly
例子:
将15 光明年转换为脚：
15 ly = 465,600,393,700,787,400 ft
| 光明年 | 脚 |
|---|---|
| 0.01 ly | 310,400,262,467,191.6 ft |
| 0.1 ly | 3,104,002,624,671,916 ft |
| 1 ly | 31,040,026,246,719,160 ft |
| 2 ly | 62,080,052,493,438,320 ft |
| 3 ly | 93,120,078,740,157,470 ft |
| 5 ly | 155,200,131,233,595,800 ft |
| 10 ly | 310,400,262,467,191,600 ft |
| 20 ly | 620,800,524,934,383,200 ft |
| 30 ly | 931,200,787,401,574,800 ft |
| 40 ly | 1,241,601,049,868,766,500 ft |
| 50 ly | 1,552,001,312,335,958,000 ft |
| 60 ly | 1,862,401,574,803,149,600 ft |
| 70 ly | 2,172,801,837,270,341,000 ft |
| 80 ly | 2,483,202,099,737,533,000 ft |
| 90 ly | 2,793,602,362,204,724,000 ft |
| 100 ly | 3,104,002,624,671,916,000 ft |
| 250 ly | 7,760,006,561,679,790,000 ft |
| 500 ly | 15,520,013,123,359,580,000 ft |
| 750 ly | 23,280,019,685,039,370,000 ft |
| 1000 ly | 31,040,026,246,719,160,000 ft |
| 10000 ly | 310,400,262,467,191,600,000 ft |
| 100000 ly | 3,104,002,624,671,916,000,000 ft |
规则