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/**********************************************************************
XyGrib: meteorological GRIB file viewer
Copyright (C) 2008-2012 - Jacques Zaninetti - http://www.zygrib.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 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, see <http://www.gnu.org/licenses/>.
***********************************************************************/
#include "Astro.h"
//----------------------------------------------------------------
Almanac Astro::getSunMoonAlmanac (time_t t, double lat, double lon)
{
struct ln_rst_time rst;
struct ln_lnlat_posn observer;
double JD;
Almanac alm;
alm.date = t;
alm.lat = lat;
alm.lon = lon;
observer.lat = lat;
observer.lng = lon;
t = Util::timestampSetHour (t, 0,0,0); // the day begins at midnight
JD = ln_get_julian_from_timet (&t);
//----------------------------------------
if (ln_get_solar_rst (JD, &observer, &rst) == 1) {
alm.sunRise = alm.sunTransit = alm.sunSet = 0; // Sun is circumpolar
}
else {
ln_get_timet_from_julian (rst.rise, &alm.sunRise);
ln_get_timet_from_julian (rst.transit, &alm.sunTransit);
ln_get_timet_from_julian (rst.set, &alm.sunSet);
}
//----------------------------------------
if (ln_get_lunar_rst (JD, &observer, &rst) == 1) {
alm.moonRise = alm.moonTransit = alm.moonSet = 0; // Sun is circumpolar
}
else {
ln_get_timet_from_julian (rst.rise, &alm.moonRise);
ln_get_timet_from_julian (rst.transit, &alm.moonTransit);
ln_get_timet_from_julian (rst.set, &alm.moonSet);
}
alm.moonPhase = ln_get_lunar_phase (JD);
alm.moonDisk = ln_get_lunar_disk (JD);
return alm;
}
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