Solar radius is a unit of distance used to express the size of stars in astronomy equal to  radius of the Sun. The solar radius is usually defined as the radius to the layer in the solar photosphere where the optical depth equals 2/3.:

The solar radius is approximately 695,700 kilometres (432,288 miles), which is about 10 times the average radius of Jupiter, 110 times the radius of the Earth, and 1/215th of an astronomical unit, the distance of Earth from the Sun. It varies slightly from pole to equator due to its rotation, which induces an oblateness of order 10 parts per million. (See 1 gigametre for similar distances.)