public static int getLunarMonth11(int yy, double timeZone)
{
double off = (VietCalendar.jdFromDate(31, 12, yy) - 2415021.0769986948);
int k = VietCalendar.INT((off / 29.530588853));
int nm = VietCalendar.getNewMoonDay(k, timeZone);
int sunLong = VietCalendar.INT((VietCalendar.getSunLongitude(nm, timeZone) / 30));
if ((sunLong >= 9))
{
nm = VietCalendar.getNewMoonDay((k - 1), timeZone);
}
return(nm);
}
public static int getLeapMonthOffset(int a11, double timeZone)
{
int k = VietCalendar.INT((0.5
+ ((a11 - 2415021.0769986948)
/ 29.530588853)));
int last;
// Month 11 contains point of sun longutide 3*PI/2 (December solstice)
int i = 1;
// We start with the month following lunar month 11
int arc = VietCalendar.INT((VietCalendar.getSunLongitude(VietCalendar.getNewMoonDay((k + i), timeZone), timeZone) / 30));
do
{
last = arc;
i++;
arc = VietCalendar.INT((VietCalendar.getSunLongitude(VietCalendar.getNewMoonDay((k + i), timeZone), timeZone) / 30));
} while (((arc != last) &&
(i < 14)));
return(i - 1);
}