void updateLocal( double lon, double lat, const string& root );
void cal_mjd (int mn, double dy, int yr);
void utc_gst();
double sidereal_precise (double lng);
double sidereal_course(double lng);
void updateLocal( double lon, double lat, const string& root );
void cal_mjd (int mn, double dy, int yr);
void utc_gst();
double sidereal_precise (double lng);
double sidereal_course(double lng);