Astronomical Unit (au)
|The astronomical unit (au) is defined by the IAU as exactly 149,597,870,700 m. It is approximately the average distance between the Earth and the Sun (about 150 billion meters). |
(See our FAQ for recent re-definition of the au.)
The list of defined terms to the left is by no means exhaustive with
respect to the general subject of solar system dynamics.
The terms listed are thought to be those more commonly used on our site
and thus appropriate for inclusion on this page.