Astronomy: As they believed that the will and actions of the Gods could be read in the stars, moon and planets, they dedicated much time to doing so and many of their most important buildings were constructed with astronomy in mind
Divination: is the 260 day Calendar followed by the Mayan people. It's basic purpose is to provide guidance in life containing the combined aspects of the 20 named days and 13 numbers, and to indicate the days on which sacrifice at specific 'number shrines' might lead to their goals.
Human sacrifice was practiced to encourage fertility, demonstrate piety, propitiate or fulfil a perceived obligation towards the gods. Tied to events such as ill fortune, warfare and the consecration of new leaders or temples. Mayan people would sacrifice their prisoners, who were most often from neighbouring kingdoms. Believed if it was neglected cosmic disorder and chaos would result.
Other Mayan religious rituals included dancing, competition, ball games, dramatic performances, and prayer to the gods.