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Month

Overview [1]#

Month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates.

The traditional concept arose with the cycle of moon phases; such months (lunations) are synodic Months and last approximately 29.53 days. From excavated tally sticks, researchers have deduced that people counted days in relation to the Moon's phases as early as the Paleolithic age. Synodic Months, based on the Moon's orbital period with respect to the Earth-Sun line, are still the basis of many calendars today, and are used to divide the year.

Julian and Gregorian calendars#

The Gregorian calendar, like the Julian calendar before it, has twelve months:
ChronologyAlphabeticDays
1January31
2February28 or 29 in leap years
3March31
4April30
5May31
6June30
7July31
8August31
9September30
10October31
11November30
12December31

More Information#

There might be more information for this subject on one of the following:
  • [#1] - Month - based on information obtained 2017-10-14-