Full moon is called a blue moon. The term "blue moon" used in this sense may date to as early as the 16th century, but it became well known in the United States due to the "Farmers' Almanac" (published since 1818). According to the "Farmers' Almanac", a "blue moon" is the third full moon in any period between either solstice and equinox, or between equinox and solstice, (calculated using the mean tropical year), which contains four full moons. These seasons are equal in length, unlike the astronomical ones, which vary in length depending on the Earth's speed in its elliptical orbit round
The Equinox serialized publications. After that, editions of the "Equinox" were published irregularly by various organizations and are best known for their book title. All issues after III:5 were edited and released after Crowley's death in 1947. Nos. 1-10 are a Period of Silence—no copies. Published long after Crowley's death, a series entitled "The Equinox, Volume V" was released by Marcelo Motta and his organization, Thelema Publishing Co. The Equinox The Equinox (subtitle: "The Review of Scientific Illuminism") is a series of publications in book form that serves as the official organ of the A∴A∴, a magical order founded by Aleister Crowley