Plate XVII. (a) The Upper Portion of Stela 1 at Yaxchilan, 
dealing with the Heavens. The Sky God is seen in the center with 
the moon at the left and the sun god at the right. Below these is 
the Two-Headed Monster bearing planet signs and additional heads 
of the Sky God; (b) Analogous Detail of Stela 4, Yaxchilan. The 
moon is at the right and the sun at the left. The figure in the sun 
is male and that in the moon, female. The faces of the Sky God 
hang from the lower part of the Two-Headed Dragon, being attached 
to it by symbols of the planet Venus. 
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