Abstract

IWANISZEWSKI, Stanislaw. Michel Graulich and the problem of seasonal shift and the vague Mexica year. Trace (Méx. DF) [online]. 2019, n.75, pp.128-154. ISSN 2007-2392.

Summary: As it is known, several researchers observed that in the sixteenth century, the meanings of the names of the twenty-day cycles of the Mexica calendar do not match the cycle of the seasons. As the vague Mexica year (Xihuitl) of 365 is approximately a quarter of a day shorter than the tropical year (also known as a solar year) of 365.2422 days, the Mexica year (Xihuitl) used to supplant the tropical year at a steady rhythm. Mi chel Graulich (1976, 1979) assumed that the lack of coincidence between the names of the rituals and of the twenty-day cycles with the seasons of the year was due to the firm nature of the passage of time and by calculating backwards, he concluded that the names of the twenty-day cycles coincided with the seasons was during the period from 680 to 683 A.D. This paper reviews his concepts and calculations.

Keywords : Xihuitl; tropical year; Julian year; Sothic cycle; Michel Graulich.

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