doCalc();

function MP(day){

day2=new Date();
day2=day; Date.UTC(day);
var Y=day2.getFullYear();
var M=day2.getMonth()+1;
var D=day2.getDate();
var YY,MM,K1,K2,K3,J,V,IP,AG;

YY=Y-Math.floor((12-M)/10);
MM=M+9;
if (MM>=12) {MM=MM-12};
K1=Math.floor(365.25*(YY+4712));
K2=Math.floor(30.6*MM+.5);
K3=Math.floor(Math.floor((YY/100)+49)*.75)-38;
J=K1+K2+D+59;  
if (J>2299160) {J=J-K3};  
V=(J-2451550.1)/29.530588853;
V=V-Math.floor(V);
if (V<0) {V=V+1};
IP=V;
AG=IP*29.53; 
IP=IP*Math.PI*2  
return IP;
}
//--------------------------------------------------------------------------------//

function calc(calcmonth,calcyear){
var Y,JJ,K1,K2,K3,D,M,MM,FM1,FM2,NM1,NM2;
FM1=0;
FM2=0;
NM1=0;
NM2=0;
Tt1="";
Tt2="";
Tt3="";
Tt4="";

Y=calcyear;  // year
M=calcmonth;
M++;
D=-1;
YY=Y-Math.floor((12-M)/10);
MM=M+9;
if(MM>=12){MM=MM-12}
K1=Math.floor(365.25*(YY+4712));
K2=Math.floor(30.6*MM+.5);
K3=Math.floor(Math.floor((YY/100)+49)*.75)-38;
JJ=K1+K2+D+59;
if (JJ>2299160){JJ=JJ-K3}

var A,B,C,Dq,E,G,D1,H1,M9,Mq,H,Yq,A1,Fq,Jq;
var R1,U,K0,T,T2,T3,J0,F0,J,M0,M1,B1,M5,M6,K9,F;
R1=3.14159265/180;
U=0;
K0=Math.floor((Y-1900)*12.3685);
T=(Y-1899.5)/100;
T2=T*T;
T3=T*T*T;
J0=2415020+29*K0;
F0=0.0001178*T2-0.000000155*T3;
F0=F0+0.75933+0.53058868*K0;
F0=F0-0.000837*T-0.000335*T2;
J=J+Math.floor(F);
F=F-Math.floor(F);
M0=K0*0.08084821133;
M0=360*(M0-Math.floor(M0))+359.2242;
M0=M0-0.0000333*T2;
M0=M0-0.00000347*T3;
M1=K0*0.07171366128;
M1=360*(M1-Math.floor(M1))+306.0253;
M1=M1+0.0107306*T2;
M1=M1+0.00001236*T3;
B1=K0*0.08519585128;
B1=360*(B1-Math.floor(B1))+21.2964;
B1=B1-0.0016528*T2;
B1=B1-0.00000239*T3;

for(K9=0;K9<29;K9++){
J=J0+14*K9;
F=F0+0.765294*K9;
K=K9/2;
M5=(M0+K*29.10535608)*R1;
M6=(M1+K*385.81691806)*R1;
B6=(B1+K*390.67050646)*R1;
F=F-0.4068*Math.sin(M6);
F=F+(0.1734-0.000393*T)*Math.sin(M5);
F=F+0.0161*Math.sin(2*M6);
F=F+0.0104*Math.sin(2*B6);
F=F-0.0074*Math.sin(M5-M6);
F=F-0.0051*Math.sin(M5+M6);
F=F+0.0021*Math.sin(2*M5);
F=F+0.0010*Math.sin(2*B6-M6);
J=J+Math.floor(F);
F=F-Math.floor(F);


Jq=J;
Fq=F;
G=1;
if ( Y<1583){G=0}

Fq=Fq+0.5;
if (!(Fq<1)){
Fq=Fq-1;
Jq=Jq+1;
}
if (G==1){ A1=Math.floor((Jq/36524.25)-51.12264);
A=Jq+1+A1-Math.floor(A1/4)
}
else {A=Jq};
B=A+1524;
C=Math.floor((B/365.25)-0.3343);
Dq=Math.floor(365.25*C);
E=Math.floor((B-Dq)/30.61);
Dq=B-Dq-Math.floor(30.61*E)+Fq;
Mq=E-1;
Yq=C-4716;
if (E>13.5){Mq=Mq-12};
if (Mq<2.5) {Yq=Yq+1};
D1=Math.floor(Dq);
H=24*(Dq-D1);
H1=Math.floor(H);
M9=Math.floor(60*(H-H1));
if (M9<10){M9="0"+M9};

if ((U==0) && (Mq==M) && (Yq==Y)){if (NM1==0){NM1=D1;Tt1=H1+":"+M9} else {if(NM2==0){NM2=D1;Tt2=H1+":"+M9}}};
if ((U==1) && (Mq==M) && (Yq==Y)){if (FM1==0){FM1=D1;Tt3=H1+":"+M9} else {if(FM2==0){FM2=D1;Tt4=H1+":"+M9}}};
U=U+1;

if (U==2){U=0};
}


var temp,dayoffset,days,i,j,monthnames,todayday;
today=new Date(Date.UTC(calcyear,calcmonth,10,1,1));
month=new Date(Date.UTC(calcyear,calcmonth,10,1,1));

todayday=today.getDate();
month.setDate(1);
dayoffset=month.getDay()-1;
if (dayoffset==-1){dayoffset=6};
today.setDate(1);
today.setMonth(today.getMonth()+1);
days=(today-month)/1000/60/60/24;

RightNow = new Date();
date = RightNow.getDate();
month.setDate(date);
document.write('<img src="/phases/moon',Math.floor(MP(month)*29/2/Math.PI)+1,'.gif" width="50" height="50">');
}

//--------------------------------------------------------------------------------//

function doCalc(){
RightNow = new Date();
month = RightNow.getMonth();
year = RightNow.getYear();
if( year < 2000 ) year += 1900;  //Netscape 3, IE 4.7 and Safari return 100 instead of 2000
calc(month,year);
}