Plate XXXVIII. The Calendar Stone of the Aztecs. This 
great stone represents the disk of the sun and the history of the 
world. It may be analyzed as follows, reading outward from the 
center. 
A Central or cosmogonic portion: The day sign 4 Olin with 
details in the arms representing four epochs of the world; with the 
face of the sun god in the center and minor hieroglyphs that may 
represent the four directions just outside the Olin symbol. 
z= Band of day signs beginning at the top and reading towards the 
elt. 
C Bands of conventional rays of the sun and other details such as 
the embellishment of the sun with turquoise and eagle feathers. 
D The outer circle of two great reptiles that may indicate the 
universe. 
E Invisible edge of the disk bears representations of Itzpapalotl, 
the obsidian butterfly which is symbolical of the heavens. 
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