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The calendar year can also be divided into quadrimesters (from French quadrimestre), [5] lasting for four months each. They can also be called the early, middle, or late parts of the year. In the Gregorian calendar: First quadrimester, early year: January 1 – April 30 (120 days or 121 days in leap years) Second quadrimester, mid-year: May 1 ...
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.
Some calendars listed are identical to the Gregorian calendar except for substituting regional month names or using a different calendar epoch. For example, the Thai solar calendar (introduced 1888) is the Gregorian calendar using a different epoch (543 BC) and different names for the Gregorian months (Thai names based on the signs of the zodiac).
A month is a unit of time, used with calendars, that is approximately as long as a natural phase cycle of the Moon; the words month and Moon are cognates.The traditional concept of months arose with the cycle of Moon phases; such lunar months ("lunations") are synodic months and last approximately 29.53 days, making for roughly 12.37 such months in one Earth year.
March equinox and September equinox: names referring to the months of the year in which they occur, with no ambiguity as to which hemisphere is the context. They are still not universal, however, as not all cultures use a solar-based calendar where the equinoxes occur every year in the same month (as they do not in the Islamic calendar and ...
This is done by giving names to periods of time, typically days, weeks, months and years. [ 1 ] [ 2 ] [ 3 ] A date is the designation of a single and specific day within such a system. A calendar is also a physical record (often paper) of such a system.
In these instances, the name of the anniversary is generally derived from the Latin word(s) for the respective number of years. When anniversaries relate to fractions of centuries (125, 150, 175, 225, 250, 275 years—i.e. 1.25, 1.5, 1.75, 2.25, 2.5, and 2.75 centuries), the situation is not as simple.
This month, instituted according to Roman tradition by Numa Pompilius, [5] was supposed to be inserted every two or three years to align the conventional 355-day Roman year with the solar year. [ b ] The decision of whether to insert the intercalary month was made by the pontifex maximus , supposedly based on observations to ensure the best ...