Light day

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

Similar units are the light second, light minute, light hour, 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 day = 24 hour = 1440 minutes = 86400 seconds
• 1 light day = 2.5902067 * 10¹³m

Comparison to other Units

• 1 light day = 2.5902068 * 10¹⁰ km
• 1 light day = 1.6094799 * 10¹⁰ mi
• 1 light day = 2.2898053 * 10¹⁴ ft
• 1 light day = 2.8326844 * 10¹³ yd