function main()

{

	var i = document.getElementById("cities").selectedIndex+1;

	var m=document.getElementById("month").selectedIndex+1;

	var d=eval(document.getElementById("day").value);

	var lg=eval(document.getElementById("longitude").value);

	var lat=eval(document.getElementById("latitude").value);

//	var lg=52.5125;

//	var lat=29.635;

	var ep=sun(m,d,4,lg)

	var zr=ep[0];

	delta=ep[1];

	ha=loc2hor(108.0,delta,lat)

	var t1=Round(zr-ha,24)

	ep=sun(m,d,t1,lg)

	zr=ep[0];

	delta=ep[1];

	ha=loc2hor(108.0,delta,lat)

	var t1=Round(zr-ha,24)

	document.getElementById("t1").innerHTML=hms(t1);

//

//   t2= Sun rise

//

	ep=sun(m,d,6,lg)

	zr=ep[0];

	delta=ep[1];

	ha=loc2hor(90.833,delta,lat)

	var t2=Round(zr-ha,24)

	ep=sun(m,d,t2,lg)

	zr=ep[0];

	delta=ep[1];

	ha=loc2hor(90.833,delta,lat)

	t2=Round(zr-ha,24)

	document.getElementById("t2").innerHTML=hms(t2);

//

//	zr=Zohr

//

	ep=sun(m,d,12,lg)

	ep=sun(m,d,ep[0],lg)

	zr=ep[0];

	document.getElementById("zr").innerHTML=hms(zr);

//

//   t2= Sun set

//

	ep=sun(m,d,18,lg)

	zr=ep[0];

	delta=ep[1];

	ha=loc2hor(90.833,delta,lat)

	var t3=Round(zr+ha,24)

	ep=sun(m,d,t3,lg)

	zr=ep[0];

	delta=ep[1];

	ha=loc2hor(90.833,delta,lat)

	t3=Round(zr+ha,24)

	document.getElementById("t3").innerHTML=hms(t3);

//

//   t2= Maghreb

//

	ep=sun(m,d,18.5,lg)

	zr=ep[0];

	delta=ep[1];

	ha=loc2hor(94.3,delta,lat)

	var t4=Round(zr+ha,24)

	ep=sun(m,d,t4,lg)

	zr=ep[0];

	delta=ep[1];

	ha=loc2hor(94.3,delta,lat)

	t4=Round(zr+ha,24)

	document.getElementById("t4").innerHTML=hms(t4);



}

function sun(m,d,h,lg)

{

	if(m<7)

		d= 31*(m-1)+d+h/24;

	else

		d=6+30*(m-1)+d+h/24;

	var M=74.2023+0.98560026*d;

	var L=-2.75043+0.98564735*d;

	var lst=8.3162159+0.065709824*Math.floor(d)+1.00273791*24*(d%1)+lg/15;

	var e=0.0167065;

	var omega=4.85131-0.052954*d;

	var ep=23.4384717+0.00256*cosd(omega);

	var ed=180.0/Math.PI*e;

	var u=M;

	for(var i=1;i<5;i++)

		u=u-(u-ed*sind(u)-M)/(1-e*cosd(u));

	var v=2*atand(tand(u/2)*Math.sqrt((1+e)/(1-e)));

	var theta=L+v-M-0.00569-0.00479*sind(omega);

	var delta=asind(sind(ep)*sind(theta));

	var alpha=180.0/Math.PI*Math.atan2(cosd(ep)*sind(theta),cosd(theta));

	if(alpha>=360)

		alpha-=360;

	var ha=lst-alpha/15;

	var zr=Round(h-ha,24);

	return ([zr,delta])

}

function init()

{

		lgs= [0,49.70,48.30,45.07,51.64,48.68,46.42,57.33,56.29,50.84,59.21,46.28,51.41,48.34,49.59,60.86,48.50,53.06,53.39,47.00,50.86,52.52,50.00,50.88,57.06,47.09,54.44,59.58,48.52,51.59,54.35];

		lats=[0,34.09,38.25,37.55,32.68,31.32,33.64,37.47,27.19,28.97,32.86,38.08,35.70,33.46,37.28,29.50,36.68,36.57,35.58,35.31,32.33,29.62,36.28,34.64,30.29,34.34,36.84,36.31,34.80,30.67,31.89];

}

function coord()

{

	var c=document.getElementById("cities");

	var i = c.selectedIndex+1;

//	if(i==0)

//	{

//		document.getElementById("longitude").value="";

//		document.getElementById("latitude").value="";

//	}

//	else

//	{

		document.getElementById("longitude").value=lgs[i].toString()

		document.getElementById("latitude").value=lats[i].toString()

//	}

}

function sind(x){return(Math.sin(Math.PI/180.0*x));}

function cosd(x){return(Math.cos(Math.PI/180.0*x));}

function tand(x){return(Math.tan(Math.PI/180.0*x));}

function atand(x){return(Math.atan(x)*180.0/Math.PI);}

function asind(x){return(Math.asin(x)*180.0/Math.PI);}

function acosd(x){return(Math.acos(x)*180.0/Math.PI);}

function sqrt(x){return(Math.sqrt(x));}

function frac(x){return(x%1);}

function floor(x){return(Math.floor(x));}

function ceil(x){return(Math.ceil(x));}

function loc2hor(z,d,p){

	return(acosd((cosd(z)-sind(d)*sind(p))/cosd(d)/cosd(p))/15);

}

function Round(x,a){

	var tmp=x%a;

	if(tmp<0)

		tmp+=a;

	return(tmp)

}

function hms(x)

{

	x=Math.floor(3600*x);

	h=Math.floor(x/3600);

	mp=x-3600*h;

	m=Math.floor(mp/60);

	s=Math.floor(mp-60*m);

//	return(((h<10)? "0" : "")+h.toString()+":"+((m<10)? "0" : "")+m.toString()+":"+((s<10)? "0" : "")+s.toString())

	return(((h<10)? "0" : "")+h.toString()+":"+((m<10)? "0" : "")+m.toString())

}