getMoonAge.c

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/* 
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 */

/*  Returns the time since the last new moon             */
/*                                                       */
/*  The file NEWMOONS contains new-moon times from       */
/*  page A1 of the Almanac.  When updating the file,     */
/*  be sure to retain at least the entry for the most    */
/*  recent, previous new moon.                           */
/*                                                       */
 
#include "extern.h"

#define NEWMOONS  "newmoons"

double getMoonAge(int yr, int mon, int day, int hr, int min)
{
  int count;
  int nm_yr, nm_mon, nm_day, nm_hr, nm_min;
  int last_nm_yr, last_nm_mon, last_nm_day, last_nm_hr, last_nm_min;
  double mjd, nm_mjd, last_nm_mjd;
  char nmfile[256];

  FILE *fp;

  sprintf(nmfile, "%s/share/%s", pkg_home, NEWMOONS);

  if((fp = fopen(nmfile, "r")) == NULL)
  {
    st_fail("getMoonAge(): Can't open %s", nmfile);

    return(0);
  }

  count = 0;
  nm_mjd = 0.0;
  mjd = getmjd(yr, mon, day, hr, min);

  while(fscanf(fp, "%d %d %d %d %d", &nm_yr, &nm_mon, &nm_day, &nm_hr, &nm_min) != EOF)
  {
    if((nm_mjd = getmjd(nm_yr, nm_mon, nm_day, nm_hr, nm_min)) > mjd)
    {
      break;
    }
    else
    {
      last_nm_yr  = nm_yr;
      last_nm_mon = nm_mon;
      last_nm_day = nm_day;
      last_nm_hr  = nm_hr;
      last_nm_min = nm_min;
      last_nm_mjd = nm_mjd;
      count++;
    }
  }

  fclose(fp);

  if(count == 0)
  {
    st_fail("getMoonAge(): no prior new moons listed in %s", nmfile);
    return(0);
  }

  last_nm_mjd = getmjd(last_nm_yr, last_nm_mon, last_nm_day, last_nm_hr, last_nm_min);

  if (nm_mjd == last_nm_mjd) 
  {
    st_fail("getMoonAge(): %s is out of date", nmfile);
  }

  return(mjd - last_nm_mjd);
}