/* 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 planetary calculations. */ #include <stdio.h> #include <libnova/mars.h> #include <libnova/julian_day.h> #include <libnova/rise_set.h> #include <libnova/transform.h> #include <libnova/utility.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[]) { struct ln_helio_posn pos; struct lnh_equ_posn hequ; struct ln_equ_posn equ; struct ln_rst_time rst; struct ln_zonedate rise, set, transit; struct ln_lnlat_posn observer; double JD; double au; /* observers location (Edinburgh), used to calc rst */ observer.lat = 55.92; /* 55.92 N */ observer.lng = -3.18; /* 3.18 W */ /* get Julian day from local time */ JD = ln_get_julian_from_sys(); printf ("JD %f\n", JD); /* longitude, latitude and radius vector */ ln_get_mars_helio_coords(JD, &pos); printf("Mars L %f B %f R %f\n", pos.L, pos.B, pos.R); /* RA, DEC */ ln_get_mars_equ_coords (JD, &equ); ln_equ_to_hequ (&equ, &hequ); printf("Mars RA %d:%d:%f Dec %d:%d:%f\n", hequ.ra.hours, hequ.ra.minutes, hequ.ra.seconds, hequ.dec.degrees, hequ.dec.minutes, hequ.dec.seconds); /* Earth - Mars dist AU */ au = ln_get_mars_earth_dist (JD); printf ("mars -> Earth dist (AU) %f\n",au); /* Sun - Mars Dist AU */ au = ln_get_mars_solar_dist (JD); printf ("mars -> Sun dist (AU) %f\n",au); /* Mars disk, magnitude and phase */ au = ln_get_mars_disk (JD); printf ("mars -> illuminated disk %f\n",au); au = ln_get_mars_magnitude (JD); printf ("mars -> magnitude %f\n",au); au = ln_get_mars_phase (JD); printf ("mars -> phase %f\n",au); /* rise, set and transit time */ if (ln_get_mars_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); } return 0; }