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Xiuhpōhualli is the Aztec year count . One year consists of 360 named days and 5 nameless (nēmontēmi). These 'extra' days are thought to be unlucky. The year was broken into 18 periods of twenty days each, sometimes compared to the Julian month. The Nahuatl word for moon is metztli but whatever name was used for these periods is
The days of the year were counted twenty by twenty. The xiuhpōhualli calendar (in history known as the "vague year" which means no leap day) had its antecedents in form and function in earlier Mesoamerican calendars, and the 365-day count has a long history of use throughout the
Next come the 5 digits of the Long Count, followed by the Calendar Round (tzolkʼin and Haabʼ) and supplementary series. The supplementary series is optional and contains lunar data, for example, the age of the moon on the day and the calculated length of current lunation. [b] The text then continues with whatever activity occurred on that date.
The Long Count calendar identifies a date by counting the number of days from August 11, 3114 BCE in the proleptic Gregorian calendar or September 6, 3114 BCE in the Julian Calendar (-3113 astronomical). The Long Count days were tallied in a modified base-20 scheme. Thus 0.0.0.1.5 is equal to 25, and 0.0.0.2.0 is equal to 40.
The nēmontēmi accounted for the remaining 5 whole days in the nearly 365 ¼ day tropical year (365.2422, actual). There were no " leap days " or " leap years " per-se, so over the course of 52 calendar years of 365 days each, the calendar accumulated a deficit of 13 days, which the Julian calendar (for example) accommodates by adding leap ...
The Aztec calendar was composed of two separate cycles—one of 260 days called the tonalpohualli (day count) and one of 365 days called the xiuhpohualli (year count). The 365-day xiuhpohualli consisted of 18 twenty-day "months" (or veintenas ), plus an additional 5 days at the end of the year.
The tōnalpōhualli (Nahuatl pronunciation: [toːnaɬpoːˈwalːi]), meaning "count of days" in Nahuatl, is a Mexica version of the 260-day calendar in use in pre-Columbian Mesoamerica. This calendar is solar and consists of 20 13-day periods. Each trecena is ruled by a different deity. Graphic representations for the twenty day names have ...
The name used for these periods in pre-Columbian times is unknown. In Nahuatl, the word for "twenty days" is cempōhualilhuitl [sempoːwalˈilwit͡ɬ] from the words cempōhualli [sempoːˈwalːi] "twenty" and ilhuitl [ˈilwit͡ɬ] "day". [2] Through Spanish usage, the 20-day period of the Aztec calendar has become commonly known as a veintena.