CHINA ECONOMIC NET BEIJING, China – China’s heaviest and most advanced satellite, Shijian-20, reached its fixed position in geosynchronous orbit Sunday, marking the first successful flight of DFH-5 satellite platform, according to the China Aerospace Science and Technology Corporation. The Shijian-20 satellite is the first verification satellite for DFH-5 satellite platform, China’s new generation of large geosynchronous orbit satellite platform. …