/* This program is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Copyright (C) 2003 Liam Girdwood <liam@gnova.org> A simple example showing some lunar calculations. */ #include <stdio.h> #include <libnova/lunar.h> #include <libnova/julian_day.h> #include <libnova/rise_set.h> #include <libnova/transform.h> void print_date (char * title, struct ln_zonedate* date) { printf ("\n%s\n",title); printf (" Year : %d\n", date->years); printf (" Month : %d\n", date->months); printf (" Day : %d\n", date->days); printf (" Hours : %d\n", date->hours); printf (" Minutes : %d\n", date->minutes); printf (" Seconds : %f\n", date->seconds); } int main (int argc, char* argv[]) { double JD; struct ln_rect_posn moon; struct ln_equ_posn equ; struct ln_lnlat_posn ecl; struct ln_lnlat_posn observer; struct ln_rst_time rst; struct ln_zonedate rise, transit, set; /* observers location (Edinburgh), used to calc rst */ observer.lat = 55.92; /* 55.92 N */ observer.lng = -3.18; /* 3.18 W */ /* get the julian day from the local system time */ JD = ln_get_julian_from_sys(); printf ("JD %f\n",JD); /* get the lunar geopcentric position in km, earth is at 0,0,0 */ ln_get_lunar_geo_posn (JD, &moon, 0); printf ("lunar x %f y %f z %f\n",moon.X, moon.Y, moon.Z); /* Long Lat */ ln_get_lunar_ecl_coords (JD, &ecl, 0); printf ("lunar long %f lat %f\n",ecl.lng, ecl.lat); /* RA, DEC */ ln_get_lunar_equ_coords (JD, &equ); printf ("lunar RA %f Dec %f\n",equ.ra, equ.dec); /* moon earth distance */ printf ("lunar distance km %f\n", ln_get_lunar_earth_dist(JD)); /* lunar disk, phase and bright limb */ printf ("lunar disk %f\n", ln_get_lunar_disk(JD)); printf ("lunar phase %f\n", ln_get_lunar_phase(JD)); printf ("lunar bright limb %f\n", ln_get_lunar_bright_limb(JD)); /* rise, set and transit time */ if (ln_get_lunar_rst (JD, &observer, &rst) == 1) printf ("Moon is circumpolar\n"); else { ln_get_local_date (rst.rise, &rise); ln_get_local_date (rst.transit, &transit); ln_get_local_date (rst.set, &set); print_date ("Rise", &rise); print_date ("Transit", &transit); print_date ("Set", &set); } /* rise, set and transit time */ if (ln_get_lunar_rst (JD - 24, &observer, &rst) == 1) printf ("Moon is circumpolar\n"); else { ln_get_local_date (rst.rise, &rise); ln_get_local_date (rst.transit, &transit); ln_get_local_date (rst.set, &set); print_date ("Rise", &rise); print_date ("Transit", &transit); print_date ("Set", &set); } /* rise, set and transit time */ if (ln_get_lunar_rst (JD - 25, &observer, &rst) == 1) printf ("Moon is circumpolar\n"); else { ln_get_local_date (rst.rise, &rise); ln_get_local_date (rst.transit, &transit); ln_get_local_date (rst.set, &set); print_date ("Rise", &rise); print_date ("Transit", &transit); print_date ("Set", &set); } return 0; }