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Calendar - Calendar subdivisions |  | Calendar - Calendar subdivisions: Encyclopedia II - Calendar - Calendar subdivisions |  | Nearly all calendar systems group consecutive days into "months" and also into "years". In a solar calendar a year approximates Earth's tropical year (that is, the time it takes for a complete cycle of seasons), traditionally used to facilitate the planning of agricultural activities. In a lunar calendar, the month approximates the cycle of the moon phase. Consecutive days m ...
See also:Calendar, Calendar - Calendar systems, Calendar - Solar calendars, Calendar - Lunar calendars, Calendar - Fiscal calendars, Calendar - Calendar subdivisions, Calendar - Other calendar types, Calendar - Complete and incomplete calendars, Calendar - Pragmatic theoretical and mixed calendars, Calendar - Uses, Calendar - Currently used calendars, Calendar - Sources |  | | Calendar, Calendar - Calendar subdivisions, Calendar - Calendar systems, Calendar - Complete and incomplete calendars, Calendar - Currently used calendars, Calendar - Fiscal calendars, Calendar - Lunar calendars, Calendar - Other calendar types, Calendar - Pragmatic theoretical and mixed calendars, Calendar - Solar calendars, Calendar - Sources, Calendar - Uses, List of calendars, Gregorian calendar, Julian calendar, Liturgical year, Calendar of saints, Christian calendar, Christian era, Eastern Orthodox Church calendar, Calculating the day of the week, Cycle studies, Runic calendar, French Republican Calendar, Wall calendar, Wikipedia:WikiProject Calendars, Zoroastrian calendar, iCalendar, hCalendar, Calendar reform |  | |
|  |  | Calendar: Encyclopedia II - Calendar - Calendar subdivisions
Calendar - Calendar subdivisions
Nearly all calendar systems group consecutive days into "months" and also into "years". In a solar calendar a year approximates Earth's tropical year (that is, the time it takes for a complete cycle of seasons), traditionally used to facilitate the planning of agricultural activities. In a lunar calendar, the month approximates the cycle of the moon phase. Consecutive days may be grouped into other periods such as the week.
Because the number of days in the tropical year is not a whole number, a solar calendar must have a different number of days in different years. This may be handled, for example, by adding an extra day (29 February) in leap years. The same applies to months in a lunar calendar and also the number of months in a year in a lunisolar calendar. This is generally known as intercalation. Even if a calendar is solar, but not lunar, the year cannot be divided entirely into months that never vary in length.
Cultures may define other units of time, such as the week, for the purpose of scheduling regular activities that do not easily coincide with months or years.
Other related archivesAfghanistan, Calculating the day of the week, Calendar of saints, Calendar reform, China, Chinese, Christian calendar, Christian era, Cro-Magnon, Cycle studies, Eastern Orthodox Church calendar, Fiscal calendar, French Republican Calendar, Gregorian calendar, Hebrew, Hebrew calendar, Hindu, ISO week, India, Indian national calendar, International Fixed Calendar, Iran, Islamic calendar, Israel, Jewish, Jewish calendar, Julian, Julian calendar, Julian day, List of calendars, Liturgical year, Lunar calendar, Muslims, Persian calendar, Runic calendar, Solar calendar, United Nations, Wall calendar, Wikipedia:WikiProject Calendars, World calendar, Zoroastrian calendar, agricultural, astronomical, calendar dates, clocks, day, days, de facto, fiscal calendar, hCalendar, holidays, iCalendar, intercalation, leap years, lunar, lunar calendar, lunisolar, lunisolar calendar, mean solar day, months, moon phase, moon phases, night, reform of the calendar, seasonal, seasons, solar, solar calendar, solar day, sunrise, sunset, tides, time, timekeeping, tropical year, week, year, years
 Adapted from the Wikipedia article "Calendar subdivisions", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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