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`"light day" = 2.59x10^10 km`

2.59015151E+10

A **Light Day** (25,901,515,140 km) is the distance light travels in one day (24 hours).

One Light Day is equal to:

- 25,901,515,140 kilometers
- 16,094,455,343 miles
- 173.14 astronomical units (ua)
- 0.0027 light years

The Speed of Light is 299,792,458.0 meter per second. Using that velocity, one can compute the distance light has traveled in a period of time.

This unit is often used in astronomy calculations is a simple linear transform.