sentences:  Institute of Astronomy of the Bulgarian Academy of Sciences
  
  The Institute of Astronomy of the Bulgarian Academy of Sciences is a leading Bulgarian research facility in the field of astronomy and astrophysics, located in Sofia, Bulgaria.The institute co-operates closely with the other two institutions involved in the same field of research in the country - the Department of Astronomy at the Faculty of Physics of Sofia University and the Astronomical centre at the Faculty of Natural Sciences of Shumen University.