Astronomical unit

The astronomical unit (AU or au or a.u. or sometimes ua) is a unit of length approximately equal to the distance from the Earth to the Sun. The currently accepted value of the AU is 149 597 870 691  ± 30 metres (about 150 million kilometres or 93 million miles).The symbol ua is recommended by the Bureau International des Poids et Mesures but in the United States and other anglophone countries the reverse - au - is more common. The International Astronomical Union recommends au and international standard ISO 31-1 uses AU. In general, capital letters are only used for the symbols of units which are named after individual scientists, while au or a.u. can also mean atomic unit or even arbitrary unit, however, the use of AU to refer to the astronomical unit is widespread.
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Noun
1. a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)
(synonym) AU
(hypernym) astronomy unit

This is the mean radius of the Earth's orbit around the Sun. (1 AU is equal to 149,597,870 km)

UNITÀ ASTRONOMICA

Eng: astronomical unit
Urdu: فَلکِیاتی اکائی ۔ فَلَک شَناسی کی ایک بُنیادی پیمائش