Everything about Calendar Year totally explained
According to the
Gregorian calendar, the
calendar year begins on
January 1 and ends on
December 31.
Generally speaking, a calendar year begins on the
New Year's day of the given calendar system and ends on the day before the following New Year's day. In the Gregorian calendar, this is normally 365 days, but 366 days in a
leap year, giving an average length of 365.2425 days.
By convention, a calendar year consists of a
natural number of
days. To reconcile the calendar year with an astronomical cycle (which couldn't possibly be reckoned in a whole number of days), certain years contain
extra days. Through further insertion of non-day units of time, the calendar year can be further synchronized; however, these extra units of time are not considered part of the calendar.
Length
In the Gregorian calendar, the length of a calendar year is normally 365 days, but 366 days in a
leap year giving an average length of 365.2425 days. This is very close to the average length of the
Islamic calendar (based on the average time between successive
vernal equinoxes, currently 365.2424 days and increasing marginally). Other formula-based calendars can have lengths which are further out of step with the solar cycle, for example, the
Julian calendar had an average length of 365.25 days, and the
Hebrew calendar has an average length of 365.2468 days.
The astronomer's
mean tropical year which is averaged over equinoxes and solstices is currently 365.24219 days, slightly shorter than the average length of the year in most calendars, but astronomer's value changes over time, so
William Herschel's suggested correction to the Gregorian calendar may become unnecessary by the year 4000.
Further Information
Get more info on 'Calendar Year'.
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