Hi. My name is Richard Graeber. I was involved in the Aztec Calendar Handbook(ACH) project with Dr. Randall C. Jimenez. As the engineer on the project, my job was technical interpretation and presentation. As new information became available, ACH went through multiple printings and editions culminating in the 4th Edition(2006). This distillation offered the clearest explanation on the calendar gearing.
It was so clear, in fact, I was able to use the conceptual scheme to design an Actionscript program for a Macromedia Flash animation that offered a dynamic visual. This animated Aztec Calendar can be viewed from External Links off the Aztec Calendar page.
I believe researchers in Native American antiquity will find it useful.