What did the aztec and spanish calendars have in common?
a: they had days designated for worship of catholic saints.
b: they were written in hieroglyphics.
c: they had days designated for religious observances.
d: they were based on mayan arithmetic.

The correct answer is:

D. They had days designated for religious observances.

Explanation:

The one thing Spanish and Aztec calendars had in common was the designated dates for religious observances. The Aztec calendar was composed by two calendars, one that specified which days were good for harvest conditions and one for their religious culture, the Aztecs worshipped several gods, and their calendar provided dates for each god's ceremonies. The Spanish calendar also known as Julian calendar and afterwards as Gregorian calendar had designated dates for feast days of Catholic saints, this calendar is the most widely used nowadays.

before, mexicans where an indian tribe but when the spanish took over, they changed their language to spanish.

hope this : d