During her trance, the High Priestess speaks and acts as the Goddess.
In contemporary traditions, some solitary Wiccans also perform the ritual, usually within a circle and performed under the light of a full Moon. The solitary will stand in the Goddess Pose (both arms held high, palms up, body and arms forming a 'Y') and recite a charge, or chant.
The name most likely comes from a depiction of two women and the moon on an ancient Greek vase, believed to date from the second century B.C.E.
In classical times, ancient Thessalian witches were believed to control the moon, according to the tract: "If I command the moon, it will come down; and if I wish to withhold the day, night will linger over my head; and again, if I wish to embark on the sea, I need no ship, and if I wish to fly through the air, I am free from my weight."
Though a number of Wiccan traditions may practice a variation of the ritual, the modern form likely originated in Gardnerian Wicca, and is considered a central element of Gardnerian and Alexandrian Wiccan ceremonies. During the modern rite, the High Priestess may recite the Charge of the Goddess, a poem written by Doreen Valiente, High Priestess in the Gardnerian tradition.
"Drawing Down the Moon" is also the title of a book by National Public Radio reporter, Margot Adler— Drawing Down the Moon: Witches, Druids, Goddess-Worshippers, and Other Pagans in America Today—originally published in 1979. Adler writes:
"... in this ritual, one of the most serious and beautiful in the modern Craft, the priest invokes into the priestess (or, depending on your point of view, she evokes from within herself) the Goddess or Triple Goddess, symbolized by the phases of the moon. She is known by a thousand names, and among them were those I had used as a child. In some Craft rituals the priestess goes into a trance and speaks; in other traditions the ritual is a more formal dramatic dialogue, often of intense beauty, in which, again, the priestess speaks, taking the role of the Goddess. In both instances, the priestess functions as the Goddess incarnate, within the circle."