The results were a joke. Then, out of curiosity, I checked my calculations and found that I had made a mistake. The new results were alarmingly accurate. To the average person a calendar is something that tells you how many days untill Christmas, when the bills are due, and so on. Actually it is an astrological chart, primarily based on the earth's position relative to the sun.
Some calendars even show the stages of the moon for any given day.
Almanacs give you all sorts of information based on the calendar. In pre-Hispanic Mexico, the day you were born could determine your training and education, your future, as interpreted by a priest. The Calendar is finally hanging in my museum, mounted on sheet of board, and framed with Huanacaxtle. A transparent varnish darkened the paper gives it an 'aged' look. At this point I can't vouch for the validity of the calendar, but the banana wine was delicious.