Dither

function moon_phase(date) { // ported from http://www.voidware.com/moon_phase.htm
    var year = date.getYear(),
        month = date.getMonth(),
        day = date.getDay();

    if (month < 3) {
        year--;
        month += 12;
    }

endel

/* 
 * modified from http://www.voidware.com/moon_phase.htm 
 */

function getMoonPhase(year, month, day)
{
    var c = e = jd = b = 0;

    if (month < 3) {
        year--;