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"...The Sacred Round of 260 days is composed of two smaller cycles: the numbers 1 through 13, coupled with 20 different day names. Each of the day names is represented by a god who carries time across the sky, thus marking the passage of night and day. The day names are Imix, Ik, Akbal, Kan, Chicchan, Cimi, Manik, Lamat, Muluc, Oc, Chuen, Eb, Ben, Ix, Men, Cib, Caban, Eiznab, Cauac, and Ahau. Some of these are animal gods, such as Chuen (the dog), and Ahau (the eagle), and archaeologists have pointed out that the Maya sequence of animals can be matched in similar sequence to the lunar zodiacs of many East and Southeast Asian civilizations.
In the 260-day tzolkin, time does not run along a line, but moves in a repeating circle similar to a spiral. The two cycles of 13 and 20 intermesh and are repeated without interruption. Thus, the calendar would begin with 1 Imix, 2 Ik, 3 Akbal, and so on to 13 Ben, after which the cycle continues with 1 Ix, 2 Men, etc. This time the day Imix would be numbered 8 Imix, and the last day in this 260-day cycle would be 13 Ahau....
The 260-day calendar was used to determine important activities related to the gods and humans. It was used to name individuals, predict the future, decide on auspicious dates for battles, marriages, and so on. Each single day had its omens and associations, and the inexorable march of the 20 days was like a perpetual fortune-telling machine, guiding the destinies of the Maya...."