Black moon years. When February is without full moon, then the preceding January or December and the following March or April have two full moons. As with the case of two new moons in a month, whether a black moon by this definition occurs depends on the time zone. Calculated in UTC, instances of a month without full moon between 1990 and 2040 are: Another use of the term is for the absence of the new moon in a calendar month. This can occur only in February; it happens about every 19 years. When February is without new moon, then the preceding
Splitting of the moon the classical poets and mystics of Persia, plays with the shapes and numerical values of Arabic letters in a complicated way: The full moon, Jami says, resembles the Arabic letter for a circular m with the numerical value 40. When Muhammad split the moon, it became like two crescent-shaped n's (the Arabic letter for "n") whose numerical value is 50 each. This would mean that, thanks for the miracle, the value of moon had increased. In another place Rumi, according to Schimmel, alludes to two miracles attributed to Muhammad in tradition, i.e. the splitting of the moon (which shows the