用VC实现对卫星任意时刻在轨道直角坐标系统和天球坐标系中坐标的计算方法，不同卫星需自行修改其初始状态参数-with VC arbitrary moment of satellites in orbit Cartesian coordinate systems and Celestial Coordinates of the calculation method different satellites take the initiative to revise its initial state

用于低轨太阳同步轨道卫星的地影参数的计算-Earth' s shadow calculation