text: LIGO operates two gravitational wave observatories in unison: the LIGO Livingston Observatory (30°33′46.42″N 90°46′27.27″W﻿ / ﻿30.5628944°N 90.7742417°W﻿ / 30.5628944; -90.7742417{{#coordinates:30|33|46.42|N|90|46|27.27|W|