Light day

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This editable, developed Main Article is subject to a disclaimer.

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A light day is the distance that light travels in a vacuum in one day (thus a unit of distance, not time). Similarly, there are the light second, light minute, light hour, light week, light month and light year.

## Contents

* 1 Numerical value
* 2 Comparison to other units
* 3 Distances in light days
* 4 Notes

### Numerical value[edit]

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

* Velocity of light in a vacuum: 299,792,458 m/s [1] (meters/second)
* 1 day = 24 hour = 1440 minutes = 86400 seconds
* 1 light day = 25,902,068,371,200 m = 2.5902067 * 1013m

### Comparison to other units[edit]

* 1 light day = 25,902,068,371.200 km = 2.5902068 * 1010 km
* 1 light day = 16,094,799,105.225 mi[2] = 1.6094799 * 1010 mi
* 1 light day = 84,980,539,275,590.551 ft[3] = 8.498053913 ft
* 1 light day = 28,326,846,425,196.850 yd [4] = 2.8326846 * 1013 yd

### Distances in light days[edit]

* The maximum distance between the Sun and Sedna[5] is about 133,593 million km or 5.1 light days

## Notes[edit]

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
5. ↑ 2003 VB12, 90377