Shiyan is a Chinese experimental satellite program consisting of a variety of test satellites. Given the classified nature of the satellites, Chinese government statements regarding the missions of Shiyan satellites follow the common refrain of agricultural monitoring and space environment observation — the same offered for other classified programs such as the Tongxin Jishu Shiyan, Yaogan, and Shijian programs. Alternatively named Tansuo satellites, Shiyan satellites occupy varying orbits including low Earth, polar Sun-synchronous, geosynchronous, and highly-elliptical orbits and are believed to accomplish a diverse set of missions from rendezvous proximity operations (RPO) to earth imaging. Though similarly named, the Shiyan satellite program is not to be confused with the separate Shijian satellite program.
Shiyan (satellite)
Taiyuan Satellite Launch Center
The Taiyuan Satellite Launch Center (TSLC) also known as Base 25 (Chinese: 二十五基地), is a People's Republic of China space and defense launch facility (spaceport). It is situated in Kelan County, Xinzhou, Shanxi Province and is the second of four launch sites having been founded in March 1966 and coming into full operation in 1968.
Long March 6 on Launch Pad 16