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Created get_moon_phase() to calculate exact moon phase

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Gergely Polonkai 2013-07-26 14:50:48 +02:00
parent 0942290599
commit 82c45bc336
1 changed files with 84 additions and 0 deletions
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84
src/gradix.c
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@ -8,6 +8,9 @@
#define IMAGEDIR "/home/polesz/Projektek/c/gradix/images"
#define EPHEDIR "/home/polesz/Projektek/c/gradix/swe/data"
#define SYNODIC 29.53058867
#define MSPERDAY 86400000
typedef enum {
SIGN_ARIES = 1,
SIGN_TAURUS,
@ -23,6 +26,23 @@ typedef enum {
SIGN_PISCES
} zodiacSign;
typedef enum {
MOON_STATE_NEW,
MOON_STATE_WAXING_CRESCENT,
MOON_STATE_WAXING_HALF,
MOON_STATE_WAXING_GIBBOUS,
MOON_STATE_FULL,
MOON_STATE_WANING_GIBBOUS,
MOON_STATE_WANING_HALF,
MOON_STATE_WANING_CRESCENT,
MOON_STATE_DARK
} moonState;
typedef struct {
moonState phase;
double visiblePercentage;
} moonPhase;
//RsvgHandle *svgHandle[SE_CHIRON + SIGN_PISCES + 1];
gboolean
@ -123,6 +143,69 @@ set_location_and_time(double lon, double lat, double alt, int year, int month, i
}
int
moonPhase *
get_moon_phase(gint year, gint month, gint day, gint hour, gint min, gint sec)
{
GDateTime *baseDate,
*gds;
GTimeSpan diff;
gdouble phasePercent,
realPercent;
moonState state;
moonPhase *ret;
baseDate = g_date_time_new_utc(2005, 5, 8, 8, 48, 0);
// TODO: this should use the time zone used at the birth place
gds = g_date_time_new_local(year, month, day, 0, 0, 0);
diff = g_date_time_difference(gds, baseDate) / 1000;
g_date_time_unref(gds);
g_date_time_unref(baseDate);
// The current phase of the moon, between 0 and 100 (both 0 and 100 are new moon, 50 is full moon)
phasePercent = fmod((diff * 100) / (SYNODIC * MSPERDAY), 100);
if (phasePercent < 0) {
phasePercent += 100.0;
}
if ((phasePercent < 0) || (phasePercent > 100)) {
fprintf(stderr, "Error during moon phase calculation!\n");
return NULL;
}
// The real percentage is a number around the illumination percentage of the moon
realPercent = (50.0 - fabs(phasePercent - 50.0)) * 2;
// Uuuugly!
if (phasePercent == 0) {
state = MOON_STATE_NEW;
} else if (phasePercent < 25) {
state = MOON_STATE_WAXING_CRESCENT;
} else if (phasePercent == 25) {
state = MOON_STATE_WAXING_HALF;
} else if (phasePercent < 50) {
state = MOON_STATE_WAXING_GIBBOUS;
} else if (phasePercent == 50) {
state = MOON_STATE_FULL;
} else if (phasePercent < 75) {
state = MOON_STATE_WANING_GIBBOUS;
} else if (phasePercent == 75) {
state = MOON_STATE_WANING_HALF;
} else if (phasePercent < 100) {
state = MOON_STATE_WANING_CRESCENT;
} else {
state = MOON_STATE_DARK;
}
ret = g_new0(moonPhase, 1);
ret->phase = state;
ret->visiblePercentage = realPercent;
return ret;
}
main(int argc, char *argv[])
{
#if !CLUTTER_CHECK_VERSION(1, 3, 6)
@ -159,6 +242,7 @@ main(int argc, char *argv[])
printf("House %2d..: %2.0f (%f)\n", p, ceilf(cusps[p] / 30.0), cusps[p]);
}
get_moon_phase(year, month, day, hour, min, sec);
printf("Asc.......: %.0f\n", ceilf(ascmc[0] / 30.0));
printf("MC........: %.0f\n", ceilf(ascmc[1] / 30.0));