Draft

(2002 -- 2012) October 20, 2002 Ai Guo-xiang of National Astronomical Observatories was elected to be an academician of the Academy of Sciences of the Third World.. October 30, 2002 . In memory of the 100th birthday of the astronomer Prof. Zhang Yu-zhe, Purple Mountain Observatory held a forum and published "Memorial Papers in Memory of the 100th Birthday of Prof. Zhang Yu-zhe". ................
................