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. By convention, a calendar year consists of a natural number of days. To reconcile the calendar year with an astronomical cycle (which could not 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.
The Gregorian year begins on January 1 and ends on December 31 with a length of 365 days in an ordinary year and 366 days in a leap year giving an average length of 365.2425 days. Other formula-based calendars can have lengths which are further out of step with the solar cycle, for example, the Julian calendar has 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 the astronomer's value changes over time, so William Herschel's suggested correction to the Gregorian calendar may become unnecessary by the year 4000.
Other articles related to "calendar year, year, years, calendar":
... Because the tournament is played late in the calendar year, in November or December, it formed part of the following year's European Tour schedule from 2006 through 2008 ... Tour's decision to realign its schedule with the calendar year for 2010, the 2009 event was the first to be part of the current calendar year's tour schedule ...
... The calendar year can be divided into 4 quarters, often abbreviated Q1, Q2, Q3 and Q4 First quarter from the beginning of January to the end of March Second quarter from the beginning of April to the end of June Third ...
... means, for a given Member State in a given calendar year, the percentage obtained by dividing the weight of waste portable batteries and accumulators collected in accordance with Article 8(1 ...
... process usually takes almost two years ... The typical periods of this process are as follows Spring of the previous calendar year – Candidates announce their intentions to run Summer to December of the previous calendar year ...
... The show does not follow a typical calendar of on and off air periods ... The official MythBusters website lists episodes by calendar year ... other hand, Discovery sells DVD sets for "seasons", which sometimes follow the calendar year and sometimes do not ...
Famous quotes containing the words year and/or calendar:
“Ring out the old, ring in the new,
Ring happy bells, across the snow:
The year is going, let him go;
Ring out the false, ring in the true.”
—Alfred Tennyson (18091892)
“To divide ones life by years is of course to tumble into a trap set by our own arithmetic. The calendar consents to carry on its dull wall-existence by the arbitrary timetables we have drawn up in consultation with those permanent commuters, Earth and Sun. But we, unlike trees, need grow no annual rings.”
—Clifton Fadiman (b. 1904)