Directory Information

Graham: Graham Sun, Primary School affiliated to South China Normal University, Guangzhou, Guangdong Province, China.

Hanggao: Hanggao observatory, Yingtan, China. Thanks to Huang Yi, Hu Yixing, Qu Yizhou, Qu Wenwen, Ge Zhiyuan, Wang Yichen, Qang Jinwie, Ye Fei.