# Light second

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The light second is the distance that the light travels in vacuum in one second and so is a unit of distance.

Similar units are the light minute, light hour, light day, light week, light month, light year.

### Numerical value

As opposed to the light year, whose value more or less depends on the definition of year, the value of the light second is defined exactly.

### Comparison to other Units

• 1 AU = 499 light seconds
• 1 light second = 299,792.458 km
• 1 light second = 186,282.397 mi[2]
• 1 light second = 983,571,056.4 ft[3]
• 1 light second = 327,857,018.8 yd[4]

### Distances in Light Seconds

• the maximum distance between earth and moon is about 1.3 light seconds
• the maximum distance between earth and sun is about 499 light seconds or 8.3 light minutes

### Notes

1. Review of Particle Physics Particle Data Group: W.-M. Yao et al., J. Phys. G 33, 1 (2006).
2. 1 mi = 1609.344 m
3. 1 ft = 0.3048 m
4. 1 yd = 0.9144 m