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Black Moon is a reference to witchcraft and bears no significance to astronomy. There is a range of, often contradictory, definitions of a black moon, some suggesting it is when there are two dark cycles of the moon in any given calendar month, and others where no full moon is present in a calendar month, being contradictory as one can only ever happen in a February, and the other can only ever occur in any other month. It is treated by wicca as a powerful astrological period in which any magical works performed would be more effective.
A black moon can only be visible during the daytime all day.
Black moons can only happen when two moons happen to seem like they are hugging the Sun.
The difference between a dark moon and a black moon is this:
Dark moon: 0.99%-0.01% visible(waning crescent) Black Moon: 0% visible New Moon: 0.01%-0.99% visible(waxing crescent)
It has also occasionally been applied to at least four different situations:
|1. The second occurrence of a new moon in a calendar month.||Cannot occur in February. Analogous to the common calendrical definition of a blue moon for months with two full moons.|
|2. The third new moon in a season that has four of them.||Analogous to the Farmers' Almanac definition of a blue moon for seasons with four full moons.|
|3. The absence of a full moon in a calendar month.||Can only occur in February, thus January and March will each have a second full moon (a calendrical blue moon).|
|4. The absence of a new moon in a calendar month.||Can only occur in February, thus January and March will each have a second new moon (see definition 1).|
In myth and folklore the full moon of each month is given a name. In many cases the waxing moon and waning moon are also given names. There are many variations, but the following list gives the most widely known names: