Abbr. See astronomical unit.
Astronomical unit. the radius of a circular orbit in which a body of negligible mass, and free of perturbations, would revolve around the Sun in 2 /k days, where k is the Gaussian gravitational constant. This is slightly less than the semimajor axis of the Earth's orbit.
Astronomical Unit. An Astronomical Unit is the mean distance between the Earth and the Sun, i.e. the Earth orbits at a distance of 1 AU from the Sun. It is equal to 149,597,870.691 kilometers.
Astronomical Unit. The average distance from the Earth to the Sun.
astronomical unit. a measure for distances within the solar system, equal to the mean ditance of the Earth from the sun, which is about 93,000,000 miles
Astronomical Unit. unit of length equal to the distance between the sun and the earth , or about 150 million km.
astronomical unit. The average distance of Earth from the Sun. Precise radar measurements yield a value for the A.U. of 149,603,500 km.