1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/*
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 <lgirdwood@gmail.com>
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>
static void print_date(char *title, struct ln_zonedate *date)
{
fprintf(stdout, "\n%s\n",title);
fprintf(stdout, " Year : %d\n", date->years);
fprintf(stdout, " Month : %d\n", date->months);
fprintf(stdout, " Day : %d\n", date->days);
fprintf(stdout, " Hours : %d\n", date->hours);
fprintf(stdout, " Minutes : %d\n", date->minutes);
fprintf(stdout, " Seconds : %f\n", date->seconds);
}
int main(int argc, const char *argv[])
{
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;
double JD;
/* 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();
fprintf(stdout, "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);
fprintf(stdout, "lunar x %f y %f z %f\n", moon.X, moon.Y, moon.Z);
/* Long Lat */
ln_get_lunar_ecl_coords(JD, &ecl, 0);
fprintf(stdout, "lunar long %f lat %f\n", ecl.lng, ecl.lat);
/* RA, DEC */
ln_get_lunar_equ_coords(JD, &equ);
fprintf(stdout, "lunar RA %f Dec %f\n", equ.ra, equ.dec);
/* moon earth distance */
fprintf(stdout, "lunar distance km %f\n", ln_get_lunar_earth_dist(JD));
/* lunar disk, phase and bright limb */
fprintf(stdout, "lunar disk %f\n", ln_get_lunar_disk(JD));
fprintf(stdout, "lunar phase %f\n", ln_get_lunar_phase(JD));
fprintf(stdout, "lunar bright limb %f\n", ln_get_lunar_bright_limb(JD));
/* rise, set and transit time */
if (ln_get_lunar_rst(JD, &observer, &rst) != 0)
fprintf(stdout, "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) != 0)
fprintf(stdout, "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) != 0)
fprintf(stdout, "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;
}
|
