 of a conjunction is the conjunction time from midnight expressed as a fraction of a day. The denominator 940 is often omitted. Since the lunar cycle is (29 + 499/940) days. The <i>xi&#462;oy&#250;</i> of a conjunction increases by 499 (mod 940) every month. If the <i>xi&#462;oy&#250;</i> is smaller than 441, adding 499 to it will still be smaller than 940 and the number of days in the month is 29. If the <i>xi&#462;oy&#250;</i> is equal to or greater than 441, adding 499 to it will make the conjunction tim