UNESCO World Heritage Centre UNESCO. English Français. Help preserve sites now! Join the 119,910 Members ... Tentative Lists of all States Parties must comply with the Operational Guidelines. Out of 193 States Parties to the Convention, 184 have submitted a Tentative List. States Parties
The Institute of Astronomy operates two modern observatories for astronomical observations and research - The National Astronomical Observatory (NAO) Rozhen (Contacts and Visites - call 0879 504 452) and Astronomical Observatory (AO) in Belogradchik. The main telescope of NAO Rozhen is a two-meter reflector, optical system Ritchey-Chretien-Coude.
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