docs: public static JulianDate getJulianEasterSunday (final int nYear)
    {
      final int a = nYear % 4;
      final int b = nYear % 7;
      final int c = nYear % 19;
      final int d = (19 * c + 15) % 30;
      final int e = (2 * a + 4 * b - d + 34) % 7;
      final int x = d + e + 114;
      final int nMonth = x / 31;
      final int nDay = (x % 31) + 1;
      return JulianDate.of (nYear, (nMonth == 3 ? Month.MARCH : Month.APRIL).getValue (), nDay);
    }