Comte's Positivist Calendar, a core component of the Religion of Humanity, was first elaborated in the Catéchisme positiviste of 1852. It provided for two cycles of festivals. In the “concrete cult” of Humanity the 13-month calendar, with its daily celebration of past great benefactors, moved historically from antiquity (first five months) to the middle ages (months six and seven) to “the modern preparation” (months eight to thirteen). Parallel with this, the “abstract cult” of Humanity would celebrate, month by month, Humanity's fundamental social relations, preparatory forms of religion, and core social functions and classes. Both series culminated in a general festival of the dead.