Folklore #154
Rituals & practice
A coven's full moon meeting is called an esbat, as distinct from the eight seasonal sabbats. There are usually thirteen a year.
The word was popularised by Margaret Murray in the 1920s from French dialect, and Murray's wider theory of a surviving pagan witch-cult has not held up at all. The word stuck anyway. Thirteen is simply how many full moons fit in a solar year most of the time, which is also where the number's reputation comes from.
Tradition: Modern Wicca; the term from Margaret Murray (1921) · checked Sep 2026
🔭 Meanwhile, in astronomy: Why Ramadan moves through the seasons