# Light day

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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

### Numerical value

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.

### Comparison to other units

• 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

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

## 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
5. 2003 VB12, 90377