658 lines
15 KiB
C
658 lines
15 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <getopt.h>
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#include <time.h>
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#include "sgdp4h.h"
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#define LIM 128
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#define D2R M_PI/180.0
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#define R2D 180.0/M_PI
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#define XKMPER 6378.135 // Earth radius in km
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#define XKMPAU 149597879.691 // AU in km
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#define XKE 0.743669161e-1
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#define CK2 5.413080e-4 /* (0.5 * XJ2 * AE * AE) */
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#define XMNPDA 1440.0 /* Minutes per day */
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#define FLAT (1.0/298.257)
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#define STDMAG 6.0
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#define MMAX 1024
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long Isat=0;
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long Isatsel=0;
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extern double SGDP4_jd0;
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struct map {
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double lat,lng;
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float alt;
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char observer[32];
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int site_id;
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} m;
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void get_site(int site_id);
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double nfd2mjd(char *date);
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double date2mjd(int year,int month,double day);
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void nfd_now(char *s);
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void obspos_xyz(double mjd,xyz_t *pos,xyz_t *vel);
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void sunpos_xyz(double mjd,xyz_t *pos,double *ra,double *de);
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double gmst(double mjd);
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double dgmst(double mjd);
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double modulo(double x,double y);
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void equatorial2horizontal(double mjd,double ra,double de,double *azi,double *alt);
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void mjd2date(double mjd,char *date);
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int properties(kep_t K,xyz_t obspos,xyz_t sunpos,float radius,float t,double *ra,double *de,double *r,float *mag);
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void dec2sex(double x,char *s,int f,int len);
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float semimajoraxis(orbit_t orb)
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{
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float xno,eo,xincl;
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float a1,betao2,betao,temp0,del1,a0,del0,xnodp,aodp;
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xno=orb.rev*2.0*M_PI/XMNPDA;
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eo=orb.ecc;
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xincl=orb.eqinc;
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a1 = pow(XKE / xno, 2.0/3.0);
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betao2 = 1.0 - eo * eo;
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betao = sqrt(betao2);
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temp0 = (1.5 * CK2) * cos(xincl)*cos(xincl) / (betao * betao2);
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del1 = temp0 / (a1 * a1);
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a0 = a1 * (1.0 - del1 * (1.0/3.0 + del1 * (1.0 + del1 * 134.0/81.0)));
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del0 = temp0 / (a0 * a0);
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xnodp = xno / (1.0 + del0);
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aodp = (a0 / (1.0 - del0));
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aodp=(aodp-1)*XKMPER;
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return aodp;
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}
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void usage(void)
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{
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printf("planscan -t <UT Date/time> -c <catalog> -s <site> -l <length> -i <NORAD>\n");
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printf(" -r <altitude> -A <elevation> -S <elevation>\n\n");
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printf("-t <UT Date/time> UT Start date/time in yyyy-mm-ddThh:mm:ss [default: now]\n");
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printf("-c <catalog> Input TLE catalog to use [default: classfd.tle]\n");
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printf("-s <site> Site number from sites.txt [default: 4171]\n");
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printf("-l <length> Search length from UT start in seconds [default: 86400 s]\n");
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printf("-i <NORAD> NORAD number of satellite to select [default: 41334]\n");
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printf("-r <altitude> Satellite altitude above surface in km [default: mean orbital altitude]\n");
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printf("-A <elevation> Minimum satellite elevation in degrees [default: 10 degrees]\n");
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printf("-S <elevation> Maximum solar elevation in degrees [default: -6 degrees\n");
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printf("-d <timestep> Time step in seconds [default: 60s]\n");
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printf("-C Select on culmination instead of maximum brightness\n");
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printf("-h Shows this help\n");
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return;
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}
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int main(int argc,char *argv[])
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{
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int arg=0,imode,i;
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int satno=-1;
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orbit_t orb;
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FILE *fp;
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char tlefile[256]="classfd.tle";
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char nfd[32];
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double mjd0,mjd,jd,tsince;
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int rv,withvel;
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kep_t K;
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double radius=-1;
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xyz_t obspos,obsvel,sunpos;
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double p,pmin,p0,p1,r,ra,de,azi,alt,sazi,salt,altmin=10.0,saltmin=-6.0,altmax,dp;
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float mag,mmin;
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int state,pstate,nstate;
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float t,length=86400.0,dt=60.0;
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char sra[16],sde[16],type[32];
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int opttype=0; // 0 magnitude; 1 elevation
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// Initialize
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nfd_now(nfd);
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mjd0=nfd2mjd(nfd);
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get_site(4171);
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// Decode options
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while ((arg=getopt(argc,argv,"t:c:i:s:l:hS:A:r:d:C"))!=-1) {
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switch (arg) {
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case 't':
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strcpy(nfd,optarg);
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mjd0=nfd2mjd(nfd);
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break;
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case 'c':
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strcpy(tlefile,optarg);
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break;
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case 's':
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get_site(atoi(optarg));
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break;
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case 'C':
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opttype=1;
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break;
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case 'i':
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satno=atoi(optarg);
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break;
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case 'r':
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radius=atof(optarg);
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break;
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case 'l':
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length=atoi(optarg);
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if (strchr(optarg,'h')!=NULL)
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length*=3600;
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else if (strchr(optarg,'m')!=NULL)
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length*=60;
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else if (strchr(optarg,'d')!=NULL)
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length*=86400;
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break;
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case 'S':
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saltmin=atof(optarg);
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break;
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case 'A':
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altmin=atof(optarg);
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break;
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case 'd':
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dt=atof(optarg);
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break;
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case 'h':
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usage();
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return 0;
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break;
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default:
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usage();
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return 0;
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}
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}
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// Error checking
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if (satno<=0) {
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fprintf(stderr,"ERROR: NORAD satellite number not provided!\n");
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return -1;
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}
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// Get TLE
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fp=fopen(tlefile,"rb");
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if (fp==NULL) {
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fprintf(stderr,"ERROR: Failed to open file with TLEs (%s)!\n",tlefile);
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return -1;
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}
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// Read TLE
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while (read_twoline(fp,satno,&orb)==0) {
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Isat=orb.satno;
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imode=init_sgdp4(&orb);
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if (imode==SGDP4_ERROR)
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continue;
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}
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fclose(fp);
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// Object found?
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if (orb.satno!=satno) {
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fprintf(stderr,"ERROR: Object %d not found in %s!\n",satno,tlefile);
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return -1;
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}
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// Object found?
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if (orb.rev<10.0) {
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fprintf(stderr,"ERROR: Object %d is not in a LEO orbit.\n",satno);
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return -1;
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}
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// Compute radius
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if (radius<0.0)
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radius=semimajoraxis(orb);
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// Print header
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printf("Observer: %s (%04d) [%+.4f, %+.4f, %.0fm]\n",m.observer,m.site_id,m.lat,m.lng,m.alt*1000.0);
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printf("Elements: %s\n",tlefile);
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printf("Object: %d\n",satno);
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printf("Radius: %g km\n",radius);
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printf("Start UT Date/Time: %s for %g h \n\n",nfd,length/3600.0);
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printf("UT Date/Time R.A. Decl. Azi. Alt. Range Mag Sun Alt. Type\n");
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printf(" (deg) (deg) (km) (deg)\n");
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printf("=====================================================================================\n");
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for (t=0.0;t<length;t+=dt) {
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// (Modified) Julian Date
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mjd=mjd0+t/86400.0;
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jd=mjd+2400000.5;
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// Get kepler
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tsince=1440.0*(jd-SGDP4_jd0);
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rv=sgdp4(tsince,1,&K);
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// Get positions
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obspos_xyz(mjd,&obspos,&obsvel);
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sunpos_xyz(mjd,&sunpos,&ra,&de);
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equatorial2horizontal(mjd,ra,de,&sazi,&salt);
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// Rough search first
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p0=0.0;
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p1=2.0*M_PI;
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for (i=0,pmin=0.0,mmin=15.0,altmax=0.0;i<MMAX;i++) {
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p=p0+(p1-p0)*(float) i/(float) (MMAX-1);
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state=properties(K,obspos,sunpos,radius,p,&ra,&de,&r,&mag);
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equatorial2horizontal(mjd,ra,de,&azi,&alt);
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if (opttype==0) {
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if (mag<mmin) {
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pmin=p;
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mmin=mag;
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}
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} else if (opttype==1) {
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if (alt>altmax && mag<15.0) {
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pmin=p;
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altmax=alt;
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}
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}
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}
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// Finer search
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p0=pmin-4.0*M_PI/(float) MMAX;
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p1=pmin+4.0*M_PI/(float) MMAX;
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for (i=0,pmin=0.0,mmin=15.0;i<MMAX;i++) {
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p=p0+(p1-p0)*(float) i/(float) (MMAX-1);
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state=properties(K,obspos,sunpos,radius,p,&ra,&de,&r,&mag);
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equatorial2horizontal(mjd,ra,de,&azi,&alt);
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if (opttype==0) {
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if (mag<mmin) {
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pmin=p;
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mmin=mag;
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}
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} else if (opttype==1) {
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if (alt>altmax && mag<15.0) {
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pmin=p;
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altmax=alt;
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}
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}
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}
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// Get properties before and after maximum
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pstate=properties(K,obspos,sunpos,radius,pmin-0.01,&ra,&de,&r,&mag);
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nstate=properties(K,obspos,sunpos,radius,pmin+0.01,&ra,&de,&r,&mag);
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state=properties(K,obspos,sunpos,radius,pmin,&ra,&de,&r,&mag);
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if (pstate<state && state==nstate)
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strcpy(type,"Egress");
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else if (pstate==state && state>nstate)
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strcpy(type,"Ingress");
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else if (opttype==0)
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strcpy(type,"Maximum");
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else if (opttype==1)
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strcpy(type,"Culmination");
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ra=modulo(ra,360.0);
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equatorial2horizontal(mjd,ra,de,&azi,&alt);
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azi=modulo(azi+180.0,360.0);
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mjd2date(mjd,nfd);
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dec2sex(ra/15.0,sra,0,2);
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dec2sex(de,sde,0,2);
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if (alt>altmin && salt<saltmin)
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printf("%s %s %s %6.2f %6.2f %7.1f %5.2f %6.2f %s\n",nfd,sra,sde,azi,alt,r,mag,salt,type);
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}
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return 0;
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}
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// Get observing site
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void get_site(int site_id)
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{
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int i=0;
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char line[LIM];
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FILE *file;
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int id;
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double lat,lng;
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float alt;
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char abbrev[3],observer[64],filename[LIM],*env;
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env=getenv("ST_DATADIR");
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sprintf(filename,"%s/data/sites.txt",env);
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file=fopen(filename,"r");
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if (file==NULL) {
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fprintf(stderr,"File with site information not found (%s)!\n",filename);
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return;
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}
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while (fgets(line,LIM,file)!=NULL) {
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// Skip
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if (strstr(line,"#")!=NULL)
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continue;
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// Strip newline
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line[strlen(line)-1]='\0';
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// Read data
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sscanf(line,"%4d %2s %lf %lf %f",
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&id,abbrev,&lat,&lng,&alt);
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strcpy(observer,line+38);
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// Change to km
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alt/=1000.0;
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if (id==site_id) {
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m.lat=lat;
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m.lng=lng;
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m.alt=alt;
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m.site_id=id;
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strcpy(m.observer,observer);
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}
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}
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fclose(file);
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return;
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}
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// nfd2mjd
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double nfd2mjd(char *date)
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{
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int year,month,day,hour,min,sec;
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double mjd,dday;
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sscanf(date,"%04d-%02d-%02dT%02d:%02d:%02d",&year,&month,&day,&hour,&min,&sec);
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dday=day+hour/24.0+min/1440.0+sec/86400.0;
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mjd=date2mjd(year,month,dday);
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return mjd;
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}
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// Compute Julian Day from Date
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double date2mjd(int year,int month,double day)
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{
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int a,b;
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double jd;
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if (month<3) {
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year--;
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month+=12;
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}
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a=floor(year/100.);
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b=2.-a+floor(a/4.);
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if (year<1582) b=0;
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if (year==1582 && month<10) b=0;
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if (year==1582 && month==10 && day<=4) b=0;
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jd=floor(365.25*(year+4716))+floor(30.6001*(month+1))+day+b-1524.5;
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return jd-2400000.5;
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}
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// Present nfd
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void nfd_now(char *s)
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{
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time_t rawtime;
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struct tm *ptm;
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// Get UTC time
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time(&rawtime);
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ptm=gmtime(&rawtime);
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sprintf(s,"%04d-%02d-%02dT%02d:%02d:%02d",ptm->tm_year+1900,ptm->tm_mon+1,ptm->tm_mday,ptm->tm_hour,ptm->tm_min,ptm->tm_sec);
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return;
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}
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// Observer position
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void obspos_xyz(double mjd,xyz_t *pos,xyz_t *vel)
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{
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double ff,gc,gs,theta,s,dtheta;
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s=sin(m.lat*D2R);
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ff=sqrt(1.0-FLAT*(2.0-FLAT)*s*s);
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gc=1.0/ff+m.alt/XKMPER;
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gs=(1.0-FLAT)*(1.0-FLAT)/ff+m.alt/XKMPER;
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theta=gmst(mjd)+m.lng;
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dtheta=dgmst(mjd)*D2R/86400;
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pos->x=gc*cos(m.lat*D2R)*cos(theta*D2R)*XKMPER;
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pos->y=gc*cos(m.lat*D2R)*sin(theta*D2R)*XKMPER;
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pos->z=gs*sin(m.lat*D2R)*XKMPER;
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vel->x=-gc*cos(m.lat*D2R)*sin(theta*D2R)*XKMPER*dtheta;
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vel->y=gc*cos(m.lat*D2R)*cos(theta*D2R)*XKMPER*dtheta;
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vel->z=0.0;
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return;
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}
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// Solar position
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void sunpos_xyz(double mjd,xyz_t *pos,double *ra,double *de)
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{
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double jd,t,l0,m,e,c,r;
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double n,s,ecl;
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jd=mjd+2400000.5;
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t=(jd-2451545.0)/36525.0;
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l0=modulo(280.46646+t*(36000.76983+t*0.0003032),360.0)*D2R;
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m=modulo(357.52911+t*(35999.05029-t*0.0001537),360.0)*D2R;
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e=0.016708634+t*(-0.000042037-t*0.0000001267);
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c=(1.914602+t*(-0.004817-t*0.000014))*sin(m)*D2R;
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c+=(0.019993-0.000101*t)*sin(2.0*m)*D2R;
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c+=0.000289*sin(3.0*m)*D2R;
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r=1.000001018*(1.0-e*e)/(1.0+e*cos(m+c));
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n=modulo(125.04-1934.136*t,360.0)*D2R;
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s=l0+c+(-0.00569-0.00478*sin(n))*D2R;
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ecl=(23.43929111+(-46.8150*t-0.00059*t*t+0.001813*t*t*t)/3600.0+0.00256*cos(n))*D2R;
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*ra=atan2(cos(ecl)*sin(s),cos(s))*R2D;
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*de=asin(sin(ecl)*sin(s))*R2D;
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pos->x=r*cos(*de*D2R)*cos(*ra*D2R)*XKMPAU;
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pos->y=r*cos(*de*D2R)*sin(*ra*D2R)*XKMPAU;
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pos->z=r*sin(*de*D2R)*XKMPAU;
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return;
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}
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// Greenwich Mean Sidereal Time
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double dgmst(double mjd)
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{
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double t,dgmst;
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t=(mjd-51544.5)/36525.0;
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dgmst=360.98564736629+t*(0.000387933-t/38710000);
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return dgmst;
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}
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// Greenwich Mean Sidereal Time
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double gmst(double mjd)
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{
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double t,gmst;
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t=(mjd-51544.5)/36525.0;
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gmst=modulo(280.46061837+360.98564736629*(mjd-51544.5)+t*t*(0.000387933-t/38710000),360.0);
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return gmst;
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}
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// Return x modulo y [0,y)
|
|
double modulo(double x,double y)
|
|
{
|
|
x=fmod(x,y);
|
|
if (x<0.0) x+=y;
|
|
|
|
return x;
|
|
}
|
|
|
|
// Convert equatorial into horizontal coordinates
|
|
void equatorial2horizontal(double mjd,double ra,double de,double *azi,double *alt)
|
|
{
|
|
double h;
|
|
|
|
h=gmst(mjd)+m.lng-ra;
|
|
|
|
*azi=modulo(atan2(sin(h*D2R),cos(h*D2R)*sin(m.lat*D2R)-tan(de*D2R)*cos(m.lat*D2R))*R2D,360.0);
|
|
*alt=asin(sin(m.lat*D2R)*sin(de*D2R)+cos(m.lat*D2R)*cos(de*D2R)*cos(h*D2R))*R2D;
|
|
|
|
return;
|
|
}
|
|
|
|
// Compute Date from Julian Day
|
|
void mjd2date(double mjd,char *date)
|
|
{
|
|
double f,jd,dday;
|
|
int z,alpha,a,b,c,d,e;
|
|
int year,month,day,hour,min;
|
|
float sec,x;
|
|
|
|
jd=mjd+2400000.5;
|
|
jd+=0.5;
|
|
|
|
z=floor(jd);
|
|
f=fmod(jd,1.);
|
|
|
|
if (z<2299161)
|
|
a=z;
|
|
else {
|
|
alpha=floor((z-1867216.25)/36524.25);
|
|
a=z+1+alpha-floor(alpha/4.);
|
|
}
|
|
b=a+1524;
|
|
c=floor((b-122.1)/365.25);
|
|
d=floor(365.25*c);
|
|
e=floor((b-d)/30.6001);
|
|
|
|
dday=b-d-floor(30.6001*e)+f;
|
|
if (e<14)
|
|
month=e-1;
|
|
else
|
|
month=e-13;
|
|
|
|
if (month>2)
|
|
year=c-4716;
|
|
else
|
|
year=c-4715;
|
|
|
|
day=(int) floor(dday);
|
|
x=24.0*(dday-day);
|
|
x=3600.*fabs(x)+0.0001;
|
|
sec=fmod(x,60.);
|
|
x=(x-sec)/60.;
|
|
min=fmod(x,60.);
|
|
x=(x-min)/60.;
|
|
hour=x;
|
|
sec=floor(1000.0*sec)/1000.0;
|
|
|
|
sprintf(date,"%04d-%02d-%02dT%02d:%02d:%02.0f",year,month,day,hour,min,sec);
|
|
|
|
return;
|
|
}
|
|
|
|
int properties(kep_t K,xyz_t obspos,xyz_t sunpos,float radius,float t,double *ra,double *de,double *r,float *mag)
|
|
{
|
|
double st,ct,sn,cn,si,ci;
|
|
xyz_t satpos;
|
|
double dx,dy,dz,rsun,rearth,psun,pearth,p;
|
|
float phase;
|
|
int state;
|
|
|
|
// Angles
|
|
sn=sin(K.ascn);
|
|
cn=cos(K.ascn);
|
|
si=sin(K.eqinc);
|
|
ci=cos(K.eqinc);
|
|
st=sin(K.theta+t);
|
|
ct=cos(K.theta+t);
|
|
|
|
satpos.x=-sn*ci*st+cn*ct;
|
|
satpos.y=cn*ci*st+sn*ct;
|
|
satpos.z=si*st;
|
|
satpos.x*=(radius+XKMPER);
|
|
satpos.y*=(radius+XKMPER);
|
|
satpos.z*=(radius+XKMPER);
|
|
|
|
// Sun position from satellite
|
|
dx=-satpos.x+sunpos.x;
|
|
dy=-satpos.y+sunpos.y;
|
|
dz=-satpos.z+sunpos.z;
|
|
|
|
// Distances
|
|
rsun=sqrt(dx*dx+dy*dy+dz*dz);
|
|
rearth=sqrt(satpos.x*satpos.x+satpos.y*satpos.y+satpos.z*satpos.z);
|
|
|
|
// Angles
|
|
psun=asin(696.0e3/rsun)*R2D;
|
|
pearth=asin(6378.135/rearth)*R2D;
|
|
|
|
pearth=asin(6378.135/rearth)*R2D;
|
|
p=acos((-dx*satpos.x-dy*satpos.y-dz*satpos.z)/(rsun*rearth))*R2D;
|
|
p-=pearth;
|
|
|
|
// Position differences
|
|
dx=satpos.x-obspos.x;
|
|
dy=satpos.y-obspos.y;
|
|
dz=satpos.z-obspos.z;
|
|
|
|
// Celestial position
|
|
*r=sqrt(dx*dx+dy*dy+dz*dz);
|
|
*ra=atan2(dy,dx)*R2D;
|
|
*de=asin(dz/ *r)*R2D;
|
|
|
|
// Visibility
|
|
if (p<-psun) {
|
|
// strcpy(state,"eclipsed");
|
|
state=0;
|
|
} else if (p>-psun && p<psun) {
|
|
// strcpy(state,"umbra");
|
|
state=1;
|
|
} else if (p>psun) {
|
|
// strcpy(state,"sunlit");
|
|
state=2;
|
|
}
|
|
|
|
// Phase
|
|
phase=acos(((obspos.x-satpos.x)*(sunpos.x-satpos.x)+(obspos.y-satpos.y)*(sunpos.y-satpos.y)+(obspos.z-satpos.z)*(sunpos.z-satpos.z))/(rsun* *r))*R2D;
|
|
|
|
// Magnitude
|
|
if (state==2)
|
|
*mag=STDMAG-15.0+5*log10( *r)-2.5*log10(sin(phase*D2R)+(M_PI-phase*D2R)*cos(phase*D2R));
|
|
else
|
|
*mag=15;
|
|
|
|
return state;
|
|
}
|
|
|
|
// Convert Decimal into Sexagesimal
|
|
void dec2sex(double x,char *s,int f,int len)
|
|
{
|
|
int i;
|
|
double sec,deg,min;
|
|
char sign;
|
|
char *form[]={"::",",,","hms"," "};
|
|
|
|
sign=(x<0 ? '-' : ' ');
|
|
x=3600.*fabs(x);
|
|
|
|
sec=fmod(x,60.);
|
|
x=(x-sec)/60.;
|
|
min=fmod(x,60.);
|
|
x=(x-min)/60.;
|
|
// deg=fmod(x,60.);
|
|
deg=x;
|
|
|
|
if (len==7) sprintf(s,"%c%02i%c%02i%c%07.4f%c",sign,(int) deg,form[f][0],(int) min,form[f][1],sec,form[f][2]);
|
|
if (len==6) sprintf(s,"%c%02i%c%02i%c%06.3f%c",sign,(int) deg,form[f][0],(int) min,form[f][1],sec,form[f][2]);
|
|
if (len==5) sprintf(s,"%c%02i%c%02i%c%05.2f%c",sign,(int) deg,form[f][0],(int) min,form[f][1],sec,form[f][2]);
|
|
if (len==4) sprintf(s,"%c%02i%c%02i%c%04.1f%c",sign,(int) deg,form[f][0],(int) min,form[f][1],sec,form[f][2]);
|
|
if (len==2) sprintf(s,"%c%02i%c%02i%c%02i%c",sign,(int) deg,form[f][0],(int) min,form[f][1],(int) floor(sec),form[f][2]);
|
|
|
|
return;
|
|
}
|