Question

Define astronomical unit (A.U.). Write its value in metres.

Answer 1

• The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun and equal to about 150 million kilometres (93 million miles). ... Originally conceived as the average of Earth's aphelion and perihelion, since 2012 it has been defined as exactly 1.495978707×1011 m.

• Unit system: Astronomical system of units; (Accepted for use with the SI)

• Astronomical units: 4.8481×10−6 pc; 1.5813×10−5 ly

Unit of: length