1. BULGARIAN-SERBIAN COOPERATION IN ASTRONOMY: LAST DECADE OF DEVELOPMENT BULGARIAN-SERBIAN COOPERATION IN ASTRONOMY: LAST DECADE OF DEVELOPMENT Milcho K. Tsvetkov Institute of Astronomy Bulgarian Academy of Science 5 th Bulgarian-Serbian Conference on Astronomy and Space Science, May 9-12,2006, Sofia Milan S. Dimitrijević Belgrade Astronomical Observatory Serbian Academy of Science and Arts

2. Introduction Introduction Present Fifth traditional conference on astronomy is result from active contacts and joint search programs between Bulgarian and Serbian astronomers during last 10 years. In the talk is summarized briefly main results from the four joint conferences held in Belogradchik (Bulgaria), Gamzigrad (Serbia), Gjolechitsa (Bulgaia) and Belgrade. We report the rising interest to participation in the conferences from both sides and also from astronomers from other European countries. Bulgarian-Serbian bilateral contacts in astronomy are on the bases of the renewed bilateral collaboration between Bulgarian and Serbian Academies of Sciences as well as the regional Balkan collaboration in Astronomy and Space sciences and programs supported by the UNECO. This 5 th conference with more than 75 participants confirm the tendency of enlargement of the Bulgarian-Serbian joint work in Astronomy and Space Sciences.

3. Brief History JENAM - Catania 1995 JENAM - Thesaloniki 1997 SOFIA – 1998 Belogradchik 1998 – 1st BSC!

4. Joint Meetings Belogradchik 1998, August 5-8 Zajecar, Gamzigrad, 2000, June 23-26 Gioletchitsa 2002, May 13-15 Belgrade 2004, April 21-24 Sofia 2006 May 9-12 Serbia May 2008 Prikuplje…

5. First: ПЪРВА Българо-Сръбска Среща - Сусрет Belogradchik 1998 BG – 18 participants Serbia – 15 particiants Makedonia – 1 (Miat Mijatovic)

6. Second: Zajecar-Gamsigrad 2000 ВТОРИ: Гъмзиргад,Зайчар 2000

7. Third: Giolechitsa 2002 Гьолечица, 2002

8. Fourth: Belgrade 2004 Белград, 2004 Fourth: Belgrade 2004 Белград, 2004

9. Now and Future Co-operation