Moon times - code

function calculateMoon(moment, lat, lng) 
	{
		var rise, set;
		var nextInfo = Gregorian.info(moment, Time.FORMAT_SHORT);
		var options = 
		{
    		:year   => nextInfo.year,
    		:month  => nextInfo.month, 
    		:day    => nextInfo.day,
    		:hour   => 0,
    		:minute => 0,
    		:second => 0
		};
        		
		var date = Gregorian.moment(options);
		var hc = 0.133 * RAD;
		
		
		var h0 = getMoonPosition(date, lat, lng) - hc;
		var h1, h2, a, b, xe, ye, d, roots, x1, x2, dx;
			
		for(var i=1; i<=24; i+=2)
	    {
			var duration1 = new Time.Duration(i * Gregorian.SECONDS_PER_HOUR);
			var date1 = date.add(duration1);
				
			var duration2 = new Time.Duration((i+1) * Gregorian.SECONDS_PER_HOUR);
			var date2 = date.add(duration2);
				
			h1 = getMoonPosition(date1, lat, lng) - hc;
			h2 = getMoonPosition(date2, lat, lng) - hc;
				
			a = (h0 + h2) / 2 - h1;
        	b = (h2 - h0) / 2;
        		
        	xe = -b / (2 * a);
        		
        	ye = (a * xe + b) * xe + h1;
        	d = b * b - 4 * a * h1;
        	roots = 0;
				
			if (d >= 0) 
			{
				dx = Math.sqrt(d) / (a.abs() * 2);
            		
            	x1 = xe - dx;
            	x2 = xe + dx;
            	if (x1.abs() <= 1) 
            	{
            		roots++;
            	}
            	if (x2.abs() <= 1) 
            	{
            		roots++;
            	}
            	if (x1 < -1) 
            	{
            		x1 = x2;
            	}
        	}

       	 	if (roots == 1) 
       	 	{
            	if (h0 < 0) 
            	{
            		rise = i + x1;
            	}
           		else 
           		{
           			set = i + x1;
           		}

        	} 
        	else if (roots == 2) 
        	{
            	rise = i + (ye < 0 ? x2 : x1);
            	set = i + (ye < 0 ? x1 : x2);
        	}

        	if (rise != null && set != null)
        	{
        		break;
        	}

        	h0 = h2;
	    }
        
		var durationRise = new Time.Duration(rise * Gregorian.SECONDS_PER_HOUR);
		var dateRise = date.add(durationRise);
		
		var nextRise = Gregorian.info(dateRise, Time.FORMAT_SHORT);
		System.println(nextRise.hour + ":" + nextRise.min); 
		
		var durationSet = new Time.Duration(set * Gregorian.SECONDS_PER_HOUR);
		var dateSet = date.add(durationSet);
		
		var nextSet = Gregorian.info(dateSet, Time.FORMAT_SHORT);
		System.println(nextSet.hour + ":" + nextSet.min); 

		return dateRise;
	}
	
	function getMoonPosition(moment1, lat, lng)
	{
		var lw  = RAD * -lng;
        var phi = RAD * lat;
        var dd = moment1.value().toDouble() / DAYS - 0.5 + J1970 - J2000;
        
        var L = RAD * (218.316 + 13.176396 * dd); // ecliptic longitude
        var M = RAD * (134.963 + 13.064993 * dd); // mean anomaly
        var F = RAD * (93.272 + 13.229350 * dd);  // mean distance

        var l  = L + RAD * 6.289 * Math.sin(M); // longitude
        var b  = RAD * 5.128 * Math.sin(F);     // latitude
        
        var e = RAD * 23.4397; 
        
        var ra = Math.atan2(Math.sin(l) * Math.cos(e) - Math.tan(b) * Math.sin(e), Math.cos(l)); 
        var dec = Math.asin(Math.sin(b) * Math.cos(e) + Math.cos(b) * Math.sin(e) * Math.sin(l)); 
        
        var H = RAD * (280.16 + 360.9856235 * dd) - lw - ra;
        var h = Math.asin(Math.sin(phi) * Math.sin(dec) + Math.cos(phi) * Math.cos(dec) * Math.cos(H));
        
		if (h < 0) 
		{
			// the following formula works for positive altitudes only.
        	return h; // if h = -0.08901179 a div/0 would occur.
        }
		
    	return h + 0.0002967 / Math.tan(h + 0.00312536 / (h + 0.08901179)); // altitude correction for refraction
	}

I used that code but it doesn't display correct times. Here is the code translate in MonkeyC