These sacred dates occur frequently in the codices, especially in scenes relating to the origin and foundation of lineages.
Note that these layouts are consistent with the norms of the two codices respectively.
The other three codices contain hieroglyphic texts in combination with pictorial scenes that form the basis of instruments known as almanacs and tables.
The likely reason for keeping the two books in separate codices is implied in the very organization of the project.
In fact, all of these codices were in the possession of diviners or tonalpouhque.
Appearing since 1889, it reproduces in phototype the important old codices in their entirety.
Because the reptile effigies on the columns match scenes in codices, the various column pairs may display specific mythical events.
Agents of these two empires must have commissioned codices from expert scribes for official documents of this sort, which needed to be free of errors.
