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Plate XVIII. Scheme of the Mayan Calendar as presented in 
the Codex Tro-Cortesianus. In the center is Itzamna, the God of 
the Sky, and his spouse, under what has been called the celestial tree. 
The band of hieroglyphs that frames in this picture contains the 
twenty day signs of the Mayan month. The figures on the outside 
are arranged in four groups, according to the four directions of the 
compass. At the top or east we again see Itzamna and his mate. In 
the north, or right hand quarter, human sacrifice is shown and the 
Death God sits opposite the God of War. In the east and in the 
south are also shown pairs of divinities. A series of dots running 
from one day sign to another covers the tonalamatl or 260 day cycle 
of names and numbers. 
102 
