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  2. List of Nakshatras - Wikipedia

    en.wikipedia.org/wiki/List_of_Nakshatras

    It stands to reason that during the original naming of these months—whenever that happened—they were indeed based on the nakshatras that coincided with them in some manner. The modern Indian national calendar is a solar calendar, much like the Gregorian calendar wherein solstices and equinoxes fall on the same date(s) every year.

  3. Menstruation - Wikipedia

    en.wikipedia.org/wiki/Menstruation

    Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...

  4. List of date formats by country - Wikipedia

    en.wikipedia.org/wiki/List_of_date_formats_by...

    Long format: d mmmm yyyy or mmmm dd, yyyy (Day first, full month name, and year or first full month name, day, and year, in left-to-right writing direction) in Afar, French and Somali and yyyy ،mmmm d (Day first, full month name, and year in right-to-left writing direction) in Arabic Dominica: No: Yes: No Dominican Republic: No: Yes: No [52 ...

  5. Positivist calendar - Wikipedia

    en.wikipedia.org/wiki/Positivist_calendar

    Every year has exactly 52 weeks divided in 13 months. Each month has exactly 28 days divided in 4 weeks. Every day of the month falls on the same weekday in each month (i.e. the 17th always falls on a Wednesday). The calendar is the same every year (perennial), unlike the annual Gregorian calendar, which differs from year to year.

  6. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    Since each lunation is approximately 29 + 1 ⁄ 2 days, [1] it is common for the months of a lunar calendar to alternate between 29 and 30 days. Since the period of 12 such lunations, a lunar year, is 354 days, 8 hours, 48 minutes, 34 seconds (354.36707 days), [1] purely lunar calendars are 11 to 12 days shorter than the solar year.

  7. Category:Months - Wikipedia

    en.wikipedia.org/wiki/Category:Months

    From January 1999 there are separate articles about months. For the first few years they seem to be forks of the sections concerned in the year articles. The contents of these sections can better be merged into the month article, after which the month articles can be transcluded in the year articles.

  8. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31. [1] It has a length of 365 days in an ordinary year but, in order to reconcile the calendar year with the astronomical cycle, it has 366 days in a leap year. With 97 leap years every 400 years, the Gregorian calendar ...

  9. Babylonian calendar - Wikipedia

    en.wikipedia.org/wiki/Babylonian_calendar

    In the cycle of 19 years, the month Addaru 2 was intercalated, except in the year that was number 17 in the cycle, when the month Ulūlu 2 was inserted instead. [ 3 ] During this period, the first day of each month (beginning at sunset) continued to be the day when a new crescent moon was first sighted—the calendar never used a specified ...