Previous Page...   Printer Version Science Constants - Unit, Astronomical Symbol: AU Value: 1.4959787 × 1011 m Category: - Units of Length Description: The astronomical unit is defined as the mean distance of the Earth from the Sun. There are 63240 AU in one light year.   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] [ Download ] [ Shop ] [ Contact ] [ About ]