Light hour

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. A light minute is 60 light seconds and a light hour is 60 light minutes, or 3600 light seconds.

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: 2.99792456 * 10⁸ m/s (meters/second)
• 1 hour = 60 minutes = 3600 seconds
• 1 light hour = 1.0792528 * 10¹²m

Comparison to other Units

• 1 AU = 0.138 light hours
• 1 light hour = 1,079,252,842 km
• 1 light hour = 670,616,625.0 mi
• 1 light hour = 9.5408557 * 10<sump>12 ft
• 1 light hour = 1.1802852 * 10¹² yd

Distances in Light Minutes

• the average distance between earth and sun is about 499 light seconds, 8.3 light minutes or 0.138 light hours