public static LocalDate CalcFeastResurrection(LocalDate dateWithYear)
{
int year = dateWithYear.CopticToGregorian().WithCalendar(CalendarSystem.Julian).Year;
// From https://en.wikipedia.org/wiki/Date_of_Easter#Julian_calendar
int goldenNum = (year) % 19;
(int month, int day) = JulianPaschalFullMoons[goldenNum];
var pashcalFullMoon = new LocalDate(year, month, day, CalendarSystem.Julian);
return(pashcalFullMoon.WithCalendar(CalendarSystem.Gregorian)
.Next(IsoDayOfWeek.Sunday)
.WithCalendar(CalendarSystem.Coptic));
}
