速度是相对于参考框架的对象位置的变化速率。它以每次距离的单位（例如每秒米（m/s））进行测量。
1 c = 327,857,018.81 yd/s
1 yd/s = 3.0501e-9 c
例子:
将15 光速转换为每秒院子：
15 c = 4,917,855,282.152 yd/s
| 光速 | 每秒院子 |
|---|---|
| 0.01 c | 3,278,570.188 yd/s |
| 0.1 c | 32,785,701.881 yd/s |
| 1 c | 327,857,018.81 yd/s |
| 2 c | 655,714,037.62 yd/s |
| 3 c | 983,571,056.43 yd/s |
| 5 c | 1,639,285,094.051 yd/s |
| 10 c | 3,278,570,188.101 yd/s |
| 20 c | 6,557,140,376.203 yd/s |
| 30 c | 9,835,710,564.304 yd/s |
| 40 c | 13,114,280,752.406 yd/s |
| 50 c | 16,392,850,940.507 yd/s |
| 60 c | 19,671,421,128.609 yd/s |
| 70 c | 22,949,991,316.71 yd/s |
| 80 c | 26,228,561,504.812 yd/s |
| 90 c | 29,507,131,692.913 yd/s |
| 100 c | 32,785,701,881.015 yd/s |
| 250 c | 81,964,254,702.537 yd/s |
| 500 c | 163,928,509,405.074 yd/s |
| 750 c | 245,892,764,107.612 yd/s |
| 1000 c | 327,857,018,810.149 yd/s |
| 10000 c | 3,278,570,188,101.487 yd/s |
| 100000 c | 32,785,701,881,014.87 yd/s |
规则