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In page Wheel of the Year:

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Two neopagan streams in Britain popularised these seasonal festival calendars in the twentieth century: the Bricket Wood coven, a Wiccan group founded by Gerald Gardner, and the Order of Bards, Ovates and Druids, a neo-Druidic group founded by Ross Nichols. Legend holds that Gardner and Nichols harmonised an eight-fold calendar during a naturist retreat, merging the four solar stations alongside their four midpoints as a unified festival cycle.[citation needed] Coordination eventually had the benefit of better aligning celebrations between the two neopagan groups.[4] Gardner's first publications refer to the Celtic festivals as "May eve, August eve, November eve (Hallowe'en), and February eve".[5]