Agop Terzan  Agop Terzan (born Terziyan) (October 31, 1927 – April 4, 2020) was a French-Armenian astronomer. Born in Istanbul, he received his BA in Mathematical and Astronomical Science in 1945. He received a master's degree in astronomy in 1949, and a PhD from Lyon University in 1965. He discovered 710 variable stars during the 1960s and 11 globular clusters, including Terzan 5 and Terzan 7 (both discovered in 1968). Subsequently, he discovered 4430 new variable stars. Terzan also discovered 158 diffuse nebulae, 124 galaxies, and 1428 high proper motion stars. He was a member of the French National Astronomy Committee and the International Astronomical Union (IAU).