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The Java code:
// Molad.java program
// This program calculate the Molad and determines when Rosh
Hashana
// will be selabrated acording to Halacha Rules.
// first year's molad is given: 20:28:00 at
Teusday.
// the program adds for every year 354 days+ 8:48:40. If this
year is a
// leap year the program will add another lunar month: 29 days+
12:44:3.33
// writen by Naftali Feldman for Programming Languages class.
Fall 97.
import java.awt.*;
import java.applet.Applet;
public class Molad extends Applet
{
int day; // the day of the week when the Molad accures
*/
int h,m,s; // the exact time of the molad
(hour,min,sec)
int year_num;
int rh_day; // the determined day when Rosh
Hashana
int flag; // will be selabrated
int l_count; // a counter for leap years
int loc; // the line location of g.drawString
int y,add_to_s;
public void init()
{
flag=0;
l_count=0;
day=3;
h=20;
m=28;
s=0;
loc=1;
}
public void paint ( Graphics g )
{
for (year_num=1;year_num<44;++year_num)
{
loc=loc+15;
g.drawString("year: "+year_num+", the molad is on "+day+" day
of the week, at time "+h+":"+m+":"+s,20,loc);
rh_day=day;
if (flag==1){
rh_day=3;
flag=0;
} else {
if (h>11) {
rh_day++; // add day
if (rh_day==8) rh_day=1;
}
if (rh_day==1 || rh_day==4 || rh_day==6) {
rh_day++;
if (rh_day==8) rh_day=1; // add day
}
// regular check init:
y=year_num;
while (y>19) y=y-19;
if ((day==3) && (h>2) && (m>21) &&
(y==1 || y==2 || y==4 || y==5 || y==7 || y==9 || y==10 || y==12 || y==13
|| y==15 || y==16 || y==18)) rh_day=5;
// leap check init:
y=year_num;
while (y>19) y=y-19;
if ((day==5) && (h>11) && (y==3 || y==6 ||
y==8 || y==11 || y==14 || y==17 || y==19)) flag=1;
} // termination of else
loc=loc+15;
g.drawString(" Rosh Hashana will be at "+rh_day+" day of the
week",20,loc);
day=day+354;
s=s+40;
m=m+48;
h=h+8;
while (s>60) {
s=s-60;
m=m+1; }
while (m>60) {
m=m-60;
h=h+1; }
while (h>24) {
h=h-24;
day=day+1; }
while (day>7) day=day-7;
y=year_num;
while (y>19) y=y-19; // check for leap
procedure
if (y==3 || y==6 || y==8 || y==11 || y==14 || y==17 || y==19)
{
loc=loc+15;
g.drawString("leap ",20,loc);
l_count=l_count+1;
if (l_count==3) // every 3 leap years we must add
another
{ l_count=0; // second. 1/3 sec for every leap
year
add_to_s=4;
} else add_to_s=3;
day=day+29;
s=s+add_to_s;
m=m+44;
h=h+12;
while (s>60)
{ s=s-60;
m=m+1; }
while (m>60)
{ m=m-60;
h=h+1; }
while (h>24)
{ h=h-24;
day=day+1; }
while (day>7) day=day-7;
}
}
}
}