maateusx
commented
5 years ago font: http://www.voidware.com/moon_phase.htm
`int moon_phase(int y, int m, int d) { //calculates the moon phase (0-7), accurate to 1 segment. //0 = > new moon. //4 => full moon.
int c,e;
double jd;
int b;
if (m < 3) {
y--;
m += 12;
}
++m;
c = 365.25*y;
e = 30.6*m;
jd = c+e+d-694039.09; /* jd is total days elapsed */
jd /= 29.53; /* divide by the moon cycle (29.53 days) */
b = jd; /* int(jd) -> b, take integer part of jd */
jd -= b; /* subtract integer part to leave fractional part of original jd */
b = jd*8 + 0.5; /* scale fraction from 0-8 and round by adding 0.5 */
b = b & 7; /* 0 and 8 are the same so turn 8 into 0 */
return b;} `
`int Moon_phase(int year,int month,int day) { //Calculates the moon phase (0-7), accurate to 1 segment. //0 = > new moon. //4 => Full moon.
int g, e;
if (month == 1) --day;
else if (month == 2) day += 30;
else // m >= 3
{
day += 28 + (month-2)*3059/100;
// adjust for leap years
if (!(year & 3)) ++day;
if ((year%100) == 0) --day;
}
g = (year-1900)%19 + 1;
e = (11*g + 18) % 30;
if ((e == 25 && g > 11) || e == 24) e++;
return ((((e + day)*6+11)%177)/22 & 7);}`
both formulae are simplified to work from 1900 to 2199 inclusive. however, ive discovered that they disagree. consider september 23, 2002. the second formula claims this a full moon, the first does not. the moon is not full on this night so the first seems more accurate. here is a command line pc program that is more accurate than the above for reference.
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