class Holidays::DateCalculator::Easter::Julian

def calculate_orthodox_easter_for(year)
  y = year
  g = y % 19
  i = (19 * g + 15) % 30
  j = (year + year/4 + i) % 7
  j_month = 3 + (i - j + 40) / 44
  j_day = i - j + 28 - 31 * (j_month / 4)
  Date.civil(year, j_month, j_day)
end