Full context:   The twelve signs are positioned in a circular pattern, creating a pattern of oppositions related to different philosophically polarized attributes. Fire and air elements are generally 180 degrees opposed in Western astrology, as well as earth and water elements. Not all systems of astrology have four elements, notably the Sepher Yetzirah describes only three elements emanating from a central divine source. Spring signs are opposite to autumn ones, winter signs are opposite to summer ones and vice versa.