# Light hour

From Citizendium, the Citizens' Compendium

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

Similar units are the light second, light minute, 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 hour is defined exactly.

- velocity of light in vacuum: 299,792,458 m/s
^{[1]}(meters/second) - 1 hour = 60 minutes = 3600 seconds
- 1 light hour = 1,079,252,848,800 m = 1.0792528 * 10
^{12}m

### Comparison to other Units

- 1 AU = 0.14 light hours
- 1 light hour = 1,079,252,848.800 km
- 1 light hour = 638,481,190.100 mi
^{[2]} - 1 light hour = 3,540,855,803,149.606 ft
^{[3]}= 3.5408558 * 10<sump>12</sup> ft - 1 light hour = 1,180,285,267,716.535 yd
^{[4]}= 1.1802853 * 10^{12}yd

### Distances in Light hours^{[5]}

- the maximum distance between sun and Mercury is about 57.9 Mio km or 0.05 light hours
- the maximum distance between sun and Venus is about 108.2 Mio km or 0.10 light hours
- the maximum distance between sun and Earth is about 149.6 Mio km or 0.14 light hours
- the maximum distance between sun and Mars is about 227.9 Mio km or 0.21 light hours
- the maximum distance between sun and Jupiter is about 778 Mio km or 0.72 light hours
- the maximum distance between sun and Saturn is about 1427 Mio km or 1.32 light hours
- the maximum distance between sun and Uranus is about 2870 Mio km or 2.66 light hours
- the maximum distance between sun and Neptune is about 4496 Mio km or 4.17 light hours
- the maximum distance between sun and Pluto is about 5946 Mio km or 5.51 light hours
- the maximum distance between sun and Sedna
^{[6]}is about 133,593 Mio km or 123.5 light hours