This calendar plaque is a scaled-down replica of the Aztec sun stone. During the Spanish invasion, the monolithic sculpture (over 3.5 metres across) was buried in the ruins of Tenochtitlan, now Mexico City. The monument is not a functioning calendar, but rather uses glyphs to reference the cyclical concepts of time and its relationship to the cosmic conflicts within the Aztec ideology. The central deity is interpreted as either the sun god or the earth god._