Which of the following influenced the development of both the mayan and aztec calendars?

the incas
religious rituals
the zapotecs
messages from quetzalcoatl

Both based their calendars on the synodic period of Venus rather than a lunar calendar or solar calendar. This probably was inherited from an earlier group such as the Zapotecs. Not the Incas, who were over a thousand miles to the south in South America and had a very different calendar.