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The first day of menstrual bleeding is the date used for the last menstrual period (LMP). The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women, and 21 to 35 days in adults. [2] [3] The average length is 28 days; one study estimated it at 29.3 days. [10]
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 unknown. Through Spanish usage, the 20-day period of the Aztec calendar has become commonly known as a veintena.
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.
Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
In the post-classic Aztec calendar the periods of 13 days called a trecena in Spanish (no indigenous word for this period is known) were also important. The days of a trecena were usually numbered from 1 to 13. There were some exceptions, such as in the Tlapanec area where they were counted from 2 to 14. [14]
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 region. The Maya civilization version of the xiuhpōhualli is known as the haab', and 20-days period was the uinal.
In Spanish, abbreviations of month names are usually three letters long, to avoid confusion between marzo (March) and mayo (May), and between junio (June) and julio (July). In Spain, the week runs from Monday to Sunday. The Spanish language also has an established convention for days of the week using one letter.
The length of annual leave depends on the number of days of absence from work: 30 calendar days (22 working days, based on a 5-day workweek) if the worker was absent no more than 5 days; 24 calendar days (18 working days) if the worker was absent between 6 and 14 days; 18 calendar days (14 working days) if the worker was absent between 15 and ...