The Aztec and Maya calendars had some similarities. The Aztec calendar had a ritual day cycle that was called Tonalpohualli. Tonalpohualli was formed using a cycle of numerals beginning with 1 and ending at 13 with a cycle of 20 day names that were very similar to the Maya's day names. However, there were also several differences between the Maya and Aztec calendars. The Aztecs had a different number system and a less specific manner of recording dates. It was common for the Aztecs to note a day and the current year only if a significant event happened on that date. This number and recording system made it possible for the same calendar date to occur twice in the same year. The Aztec system led to confusion. The confusion was heightened by the fact that years of the same name recurred in 52-year intervals and by the fact that many of the towns started their year at different months. According to the excerpt, which of these were similarities between the Mayan and Aztec calendar? A. names of the days on the calendar B. different towns used different calendars C. accuracy in recording dates D. number systems on the calendar