 He identified the Halley's comet depicted on ancient coins of Armenian king Tigranes the Great, I c. BC.as the earliest known image of that comet He revealed the observation of supernova SN 1054 (progenitor of Crab nebula) in Armenian medieval chronicle of Hetum (Hayton of Corycus) and Cronaca Rampona.Member of Euroscience Governing Board (elected in 1998, reelected in 2002).