Codex Tro-Cortesianus
(Codex Madrid)

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he texts in the three surviving almanacs giving information on the aspects of the gods of days, such as which are favourable or unfavourable for sowing crops or hunting. There are also passages on astronomical matters, but, again, with emphasis on the gods involved.

Codex Madrid, of crude workmanship, almost surely is not earlier than the fifteenth century. It treats of divination and ceremonies connected with various crafts and rituals of general importance, such as those of the new year.

J. E. S. Thompson
The Rise and Fall of Maya Civilisation, 1954, p. 138

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