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 pc = 3.262 ly
1 ly = 0.307 pc
例子:
将15 parsec转换为光明年：
15 pc = 48.927 ly
| parsec | 光明年 |
|---|---|
| 0.01 pc | 0.033 ly |
| 0.1 pc | 0.326 ly |
| 1 pc | 3.262 ly |
| 2 pc | 6.524 ly |
| 3 pc | 9.785 ly |
| 5 pc | 16.309 ly |
| 10 pc | 32.618 ly |
| 20 pc | 65.236 ly |
| 30 pc | 97.854 ly |
| 40 pc | 130.472 ly |
| 50 pc | 163.091 ly |
| 60 pc | 195.709 ly |
| 70 pc | 228.327 ly |
| 80 pc | 260.945 ly |
| 90 pc | 293.563 ly |
| 100 pc | 326.181 ly |
| 250 pc | 815.453 ly |
| 500 pc | 1,630.906 ly |
| 750 pc | 2,446.359 ly |
| 1000 pc | 3,261.812 ly |
| 10000 pc | 32,618.116 ly |
| 100000 pc | 326,181.165 ly |
规则