说明：  本Matlab代码提供了地理坐标丰富的转换功能：涵盖了经纬度坐标转东北天坐标；经纬度坐标转地心直角坐标；地心直角坐标转东北天；地心直角坐标转经纬度的功能；
(This Matlab code provides a rich conversion function of geographic coordinates: covering latitude and longitude coordinates to northeast celestial coordinates; latitude and longitude coordinates to geocentric orthogonal coordinates; geocentric rectangular coordinates to northeast heaven; geocentric rectangular coordinates to latitude and longitude;)