Specifically:
* 1 AU = 149,597,870.7 kilometers (92,955,807.3 miles)
This is a slightly more precise definition than simply saying "the distance between the Earth and the Sun," as the Earth's orbit is not perfectly circular, but slightly elliptical. The AU represents the *average* distance throughout the year.
It's important to note that the AU is not a fixed unit of measurement like a meter or a kilometer. It is based on the Earth-Sun distance, which is constantly changing due to the Earth's elliptical orbit. However, the AU is still a very useful unit for measuring distances within our solar system.
