File indexing completed on 2024-04-14 03:46:44

 #ifndef _sgp4ext_
 #define _sgp4ext_
 /*     ----------------------------------------------------------------
 *
 *                                 sgp4ext.h
 *
 *    this file contains extra routines needed for the main test program for sgp4.
 *    these routines are derived from the astro libraries.
 *
 *                            companion code for
 *               fundamentals of astrodynamics and applications
 *                                    2007
 *                              by david vallado
 *
 *       (w) 719-573-2600, email dvallado@agi.com
 *
 *    current :
 *              20 apr 07  david vallado
 *                           misc documentation updates
 *    changes :
 *              14 aug 06  david vallado
 *                           original baseline
 *       ----------------------------------------------------------------      */
 
 #include <cstring>
 #include <cmath>
 
 #include "sgp4unit.h"
 
 
 // ------------------------- function declarations -------------------------
 
 double  sgn
         (
           double x
         );
 
 double  mag
         (
           double x[3]
         );
 
 void    cross
         (
           double vec1[3], double vec2[3], double outvec[3]
         );
 
 double  dot
         (
           double x[3], double y[3]
         );
 
 double  angle
         (
           double vec1[3],
           double vec2[3]
         );
 
 void    newtonnu
         (
           double ecc, double nu,
           double& e0, double& m
         );
 
 void    rv2coe
         (
           double r[3], double v[3], double mu,
           double& p, double& a, double& ecc, double& incl, double& omega, double& argp,
           double& nu, double& m, double& arglat, double& truelon, double& lonper
         );
 
 void    jday
         (
           int year, int mon, int day, int hr, int minute, double sec,
           double& jd
         );
 
 void    days2mdhms
         (
           int year, double days,
           int& mon, int& day, int& hr, int& minute, double& sec
         );
 
 void    invjday
         (
           double jd,
           int& year, int& mon, int& day,
           int& hr, int& minute, double& sec
         );
 
 #endif