The Pleiades (Tianquiztli) are portrayed in the upper left
of the document. The other symbols represent other constellations, a meteor or shooting star, the sun, the moon, the eclipses. The image is from the Primeros Memoriales, a sixteenth-century colonial manuscript
compiled by Fray Bernardino de Sahagun.
Click on image for full size
Image courtesy of the book 'Moctezuma's Mexico' by David Carrasco and Eduardo Matos Moctezuma. University Press of Colorado, 1992.
The Pleiades were known to the Aztecs as Tianquiztli which means the
"marketplace." The Pleiades marked for the Aztecs the fifth cardinal point. The Aztecs were very sophisticated observers of the movements of planets
in the sky. Time was measured by the Aztecs according to the movement of the Sun
Their calendar was based on cycles of fifty-two years. At the end of
each cycle, a religious ceremony would take place to ensure the movement of the
cosmos and the rebirth of the Sun. Aztecs believed that they could prevent the demons of darkness from descending to Earth and devouring men, by offering to the gods human sacrifices. During the ceremony, the priests would watch
with anxiety the passage of the Pleiades (Tianquiztli) through the overhead
position at midnight.
The crossing of the meridian by the Pleiades signaled that the cosmos did not interrupt their movement, and the world would not end then. Another fifty-two years of life were thus secured. At that specific moment, the Aztec priests would start a small fire on the slashed chest of the victim. The same fire was then carried to the temple of the Sun god Huitzilopochtli, and to the homes of the Aztec people.
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