The astronomical unit (symbol au, or ua) is a uni... - dofaq.co
astronomical unit

The astronomical unit (symbol au, or ua) is a uni...

wikipedia - 14 Jul 2015
The astronomical unit (symbol au, or ua) is a unit of length, roughly the distance from Earth to the Sun. However, that distance varies as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 7011149597870700000♠149597870700 metres (about 150 million kilometres, or 93 million miles). The astronomical unit is used primarily as a convenient

What's New