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How did the Aztecs use stars?

ORIGINAL QUESTION received from - and thanks to - Samuel Lopez Matos: I’d like to know how the Aztecs used stars. I’ve had trouble finding what I need elsewhere, so I chose to turn to you. Please help! (Answered by Ian Mursell/Mexicolore)

The Mexican scholar Yolotl González Torres discusses this in detail in her little book El culto a los astros entre los mexicas (SEP, Mexico, 1975, p.16) (our translation):-
The central importance of observing the stars was economic, ie it was a way to mark key moments in the farming cycle and of other activities linked to the seasons. Stars acted as compass, map and calendar. The combination of two calendars, solar and lunar, allowed the Aztecs to pinpoint the main phases in their economic life. Sun and moon are the two celestial bodies most linked to nature and act(ed) as symbols of those key pairs of opposites so necessary for life - fire and water, light and darkness, the very cycle of life and matter.
Solar phases and the completion of a star or constellation’s zenith in the sky marked cycles and ‘coincidences’ celebrated by religious festivals: for example, the moment when the Pleiades reached their zenith signalled the start of a new calendar cycle of 52 years.

Image from the Codex Zouche-Nuttall scanned from our own copy of the ADEVA facsimile edition, Graz, Austria, 1987.

Comments (5)

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Nathaniel

23rd Apr 2024

Hey me again thanks for the last reply I was just wondering if the aztecs used the stars as a compass to find their way around and if they did how did they use the stars as a compass

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Mexicolore

Navigating by the stars is the same principle all over the world: ‘Stars move across the sky from east to west, and some stars, called rise and set stars, begin and end their nightly path below the horizon. Sailors determined their heading by watching the movement of the stars the same way they watched the sun’s movement’ (formula boats.com)

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Nathaniel

22nd Apr 2024

Hey I was just wondering how the Aztecs used compasses and how big is it????????????

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Mexicolore

They didn’t have compasses as we know them on the ground - they didn’t need them as they knew their own landscape and world so well. Having said that, some say the four key ‘year-bearer’ signs on the great Aztec Sunstone (House, Rabbit, Reed, Flint), apart from being calendar signs were also compass points (Flint = N, Reed = E, House = W, Rabbit = S)... Check the size of it - one heck of a compass!

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Taytay

27th Jul 2023

Oh wow I didn’t;t now any of that! I’m definitely going to be researching this - thank you!!!1 :D

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Taytay

6th Jun 2023

Hi! I have a question about the Centzon Mimixcoa!
I have seen some sources state that five of the Mimixcoa (Cuāuhtli-icohuauh, Mix-cōātl, Tlo-tepētl, Apan-teuctli, and Cuetlach-cihuatl) killed the rest of the Mimixcoa and turned them into stars. Is this a true myth?

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Mexicolore

It’s part of the myth contained in the important manuscript ‘Leyenda de los Soles’/Codex Chimalpopoca. In the story of the Mexica migration from Aztlan, a (mesquite) tree features (shown in the Codex Boturini) linked to the moment in the journey when Huitzilopochtli tells the Aztecs they are from then on to be called Mexica. The five Mimixcoa you mention hide in the tree, pursued by all their kinsmen (Cloud Snakes) who, unlike the five, all refuse to worship the sun god. ‘When they are encircled by their innumerable enemies, the tree breaks...’, the five emerge and work miracles including an earthquake, a mountain collapses and a flood. ‘By means of these disasters they kill the Cloud Snakes and offer them to the Sun God as “food and drink” (Rudolph van Zantwijk, ‘The Aztec Arrangement’). But there’s no mention of them being turned into stars!

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