Fengyun-4 B star officially takes over from A star to provide services to more countries jointly building the “Belt and Road”. Star B will be launched in June 2021 and previously carried out monitoring services at 133 degrees east longitude.
Star A is positioned as a scientific research test star, and later it is responsible for my country's geostationary orbit meteorological observation business. It is like a guardian in the night sky, always watching the earth, recording changes in the sky.