Examples of how to use solar functions.
#include <stdio.h>
#include <libnova/solar.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;
observer.lat = 55.92;
observer.lng = -3.18;
printf ("JD %f\n", JD);
printf("Solar Coords longitude (deg) %f\n", pos.L);
printf(" latitude (deg) %f\n", pos.B);
printf(" radius vector (AU) %f\n", pos.R);
printf("Solar Position RA %f\n", equ.ra);
printf(" DEC %f\n", equ.dec);
printf ("Sun 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;
}
double ln_get_julian_from_sys()
Calculate julian day from system time.
Definition: julian_day.c:249
void LIBNOVA_EXPORT ln_get_solar_equ_coords(double JD, struct ln_equ_posn *position)
Calculate apparent equatorial coordinates.
Definition: solar.c:56
void LIBNOVA_EXPORT ln_get_solar_geom_coords(double JD, struct ln_helio_posn *position)
Calculate solar geometric coordinates.
Definition: solar.c:39
int LIBNOVA_EXPORT ln_get_solar_rst(double JD, struct ln_lnlat_posn *observer, struct ln_rst_time *rst)
Calculate the time of rise, set and transit for the Sun.
Definition: solar.c:139
Equatorial Coordinates.
Definition: ln_types.h:171
Heliocentric position.
Definition: ln_types.h:217
Ecliptical (or celestial) Longitude and Latitude.
Definition: ln_types.h:201
Rise, Set and Transit times.
Definition: ln_types.h:318
Human readable Date and time with timezone information used by libnova.
Definition: ln_types.h:87
int minutes
Definition: ln_types.h:92
int months
Definition: ln_types.h:89
int hours
Definition: ln_types.h:91
int years
Definition: ln_types.h:88
int days
Definition: ln_types.h:90
double seconds
Definition: ln_types.h:93