LEARNit Dictionary
astronomical unit
noun
/ˌæstrənɒmɪkl ˈjuːnɪt/
UK
/ˌæstrənɑːmɪkl ˈjuːnɪt/
US
1
a unit of measurement equal to 149.6 million kilometres, which is the distance from the centre of the earth to the sun
واحد نجومی