Technology

Calendars

  Crocodile
1,8,2


Flower
7,1


Rain 
6,13


Flint
5,12

Movement
4,11

  Wind
2,9

 

The Aztecs used two different calenders, one measured time, while the other was used to fix religious festivals. The time-measuring calender was used to fix the best time for planting crops, while the religious calender told when to consult the gods. In the time-measuring calender, one year had 365 days divided into 18 months. Each month had 20 days, and there were 5 extra days at the end of the year, which were thought to be bad-luck days when disasters were most likely to happen. The fundamental Aztec calender, the religious calender, was a 260-day cycle, called the tonalpohualli, or the "count of days."

Elizabeth Hill Boone excellently described how the religious calender worked in her book, "The Aztec World." She said, "Twenty day signs ran consecutively, from crocodile through flower, repeating after the 20th day. Beside the day signs ran 13 day numbers, 1 through 13, the numbers advancing with each day up to 13, when they repeated again with 1. Thus, the day count began with 1 Crocodile, 2 Wind, 3 House, 4 Lizard, and continued up to 13 Reed, when the numbers began again with 1: 1 Jaguar, 2 Eagle, 3 Vulture, and so forth. The 20 day signs and the 13 numbers, advancing side by side, yielded 260 uniquely named days. "

Both calenders ran together and the same day in each fell at the same time once every 52 years. Thus, Aztec time was divided into 52-year cycles, similar to our current 100-year cycles called centuries. Different days belonged to different gods, so days could be good or bad depending on which god's day it was. A child born on a bad day received its name on a good day, to rule out all harmful effects of the bad day.

At the center of the Aztecs' calendar stone is the sun god, Tonatiuh. He is surrounded by symbols of the five world creations. The symbols of the 20 days of the solar month are depicted on the stone. Also, eclipses of the sun were foretold by the calendar stone.

 
Vulture
3,10

  House
3,10

 
Eagle
2,9

  Lizard
4,11

  Jaguar
1,8

  Serpent
5,12

 
Reed
13,7

  Death
6,13


Grass
12,6

  Deer
7,1

Rabbit
8,2

 

Water
9,3

 



Dog
10,4

 
Monkey
11,5

 

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