Two of the world’s leading scholars of the Aztec language and culture have translated Sahagun’s monumental and encyclopedic study of native life in Mexico at the time of the Spanish Conquest. This immense undertaking is the first complete translation into any language of Sahagun’s Nahuatl text, and represents one of the most distinguished contributions in the fields of anthropology, ethnography, and linguistics. Written between 1540 and 1585, the Florentine Codex (so named because the manuscript has been part of the Laurentian Library’s collections since at least 1791) is the most authoritative statement we have of the Aztecs’ lifeways and traditions-a rich and intimate yet panoramic view of a doomed people. The Florentine Codex is divided by subject area into twelve books and includes over 2,000 illustrations drawn by Nahua artists in the sixteenth century. Book Seven tells the origin stories of the sun, the moon, and the stars-what gods created them, what powers they each embody, and how they are related to Aztec astrology. This book also discusses the meaning and cause behind hail, lightning, rainbows, wind, and different types of weather.