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Use proper formula for dusk/dawn.

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This commit is contained in:
David F. Skoll
2011-12-26 14:41:21 -05:00
parent 61bcce3104
commit 77ed694111
1 changed files with 5 additions and 6 deletions
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11
src/funcs.c
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@@ -1894,11 +1894,6 @@ static int SunStuff(int rise, double cosz, int jul)
/* Sun's true longitude */
L = M + 1.916*sin(DEGRAD*M) + 0.02*sin(2*DEGRAD*M) + 282.565;
if (dusk_or_dawn == 2) {/* dusk */
L += 6;
} else if (dusk_or_dawn == 3) {/* dawn */
L -= 6;
}
if (L > 360.0) L -= 360.0;
/* Tan of sun's right ascension */
@@ -1975,9 +1970,13 @@ static int SunStuff(int rise, double cosz, int jul)
static int FSun(int rise, func_info *info)
{
int jul = JulianToday;
static double cosz = -0.014543897; /* for sunrise and sunset */
double cosz = -0.014543897; /* for sunrise and sunset */
int r;
/* Civil twilight: 6 degrees */
if (rise == 2 || rise == 3) {
cosz = -0.1047197551;
}
if (Nargs >= 1) {
if (!HASDATE(ARG(0))) return E_BAD_TYPE;
jul = DATEPART(ARG(0));