1. EFOSC2 has a 4.1 x 4.1 arcminute field of view and is attached to the 3.6-metre telescope at ESO`s La Silla Observatory in Chile.
EFOSC2的视场大小为4.1 x 4.1角秒。
noun
1. danci.911cha.com
1. a unit of angular distance equal to a 60th of a degree
Synonym: minute minute of arc