For simplicity, an AU is usually rounded off to 93,000,000 miles or 149,637,000 kilometers.2. An astronomical unit is used to describe planetary distances.
Light travels this distance in approximately 8.3 minutes.
2. A unit of length used by astronomers to measure distances in space.
One astronomical unit, or AU, is equal to the average distance between the earth and the sun, which is 92,955,806 miles or 149,597,870 kilometers.