They had none, for the very good reason that none exist. The proof in this is their defeat by the Spanish in the 16th century.
they can predict the future
The priests who read the omens of the gods were the Augurs. The practice of reading the omens of the gods was called augury.
Regretably, they had no such device for predicting the future, for the good reason that no such device exists. You may know the truth of this by the following simple thought experiment: 1. The priests were charged with the preservation of their culture - or at the very least, their continued existence. 2. If they'd had such a device as to predict the future, they'd have used it to find out what dangers were going to come to them. 3. And yet the Spanish came and completely obliterated them, when any historian will tell you that it need not have been if the Aztecs had known of and understood the Spanish in advance. See? The "magic" of logic shows that no predictive device existed.
your mom did.
ortesion
oracle bones are cattle or sheep bones used to predict the future. writing on objects used to predict the future because they have oracle bones. priests heated it to and waited for it to crack. the patterns told the future.
They are bones that the Ancient Chinese used to predict the future.
To augur is to predict the future or presage. Augurs (priests) in ancient Rome predicted the outcome of various undertakings by studying the flight of birds. This was separate from the haruspex, the study of the entrails of sacrificed animals.(*not to be confused with auger, a drilling or transporting screw.)
You can not predict the future. What you predict Is wrong.
The future is difficult to predict accurately (but very easy to predict inaccurately) so allow me to predict that Africa is facing a difficult future.
how was writing on objects used to predict the future
Oracle bones were used to predict the future. People could tell the future from the cracks in the bones when they put it in fire.