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Remove year_radian

master
Kenny Levinsen 2020-09-13 21:22:17 +02:00
parent 5ebc0bd70c
commit 98148d6610
1 changed files with 3 additions and 6 deletions
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9
color_math.c
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@ -20,14 +20,11 @@ static double degrees(double radians) {
return radians * 180.0 / M_PI; return radians * 180.0 / M_PI;
} }
static double year_radian(struct tm *tm) {
// https://www.esrl.noaa.gov/gmd/grad/solcalc/solareqns.PDF
return 2 * M_PI / days_in_year(tm->tm_year) * (tm->tm_yday - 1 + (tm->tm_hour - 12)/24);
}
void sun(struct tm *tm, double longitude, double latitude, time_t *sunrise, time_t *sunset) { void sun(struct tm *tm, double longitude, double latitude, time_t *sunrise, time_t *sunset) {
double year_rad = year_radian(tm);
// https://www.esrl.noaa.gov/gmd/grad/solcalc/solareqns.PDF // https://www.esrl.noaa.gov/gmd/grad/solcalc/solareqns.PDF
double year_rad = 2 * M_PI /
days_in_year(tm->tm_year) *
(tm->tm_yday - 1 + (tm->tm_hour - 12)/24);
double eqtime = 229.18 * (0.000075 + double eqtime = 229.18 * (0.000075 +
0.001868 * cos(year_rad) - 0.001868 * cos(year_rad) -
0.032077 * sin(year_rad) - 0.032077 * sin(year_rad) -