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December 18 is the 352nd day of the year (353rd in leap years) in the Gregorian calendar; 13 days remain until the end of the year.
The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.
December. December is the twelfth and final month of the year in the Julian and Gregorian calendars. Its length is 31 days. December’s name derives from the Latin word decem (meaning ten) because it was originally the tenth month of the year in the calendar of Romulus c. 750 BC, which began in March.
In some years where December 25 falls on a Thursday, Friday, Saturday, Sunday, or Monday, various presidents have issued executive orders declaring a one-time holiday on either Christmas Eve (December 24) or the Day after Christmas (December 26), to provide federal workers with a longer weekend.
A date without the year may also be referred to as a date or calendar date (such as "20 May" rather than "20 May 2024"). As such, it is either shorthand for the current year or it defines the day of an annual event, such as a birthday on 31 May, a holiday on 1 September, or Christmas on 25 December.
The Julian calendar has two types of year: "normal" years of 365 days and "leap" years of 366 days. There is a simple cycle of three "normal" years followed by a leap year and this pattern repeats forever without exception. The Julian year is, therefore, on average 365.25 days long.
Easter may occur on different dates in the Gregorian Calendar (Western) and the Julian Calendar (Orthodox or Eastern). The accompanying table provides both sets of dates, for recent and forthcoming years—see the computus article for more details on the calculation.
An independence day is an annual event commemorating the anniversary of a nation's independence or statehood, usually after ceasing to be a group or part of another nation or state, or after the end of a military occupation, or after a major change in government.
The Feast of the Immaculate Conception celebrates the Immaculate Conception of the Blessed Virgin Mary on 8 December, nine months before the feast of the Nativity of Mary on 8 September. It is one of the most important Marian feasts in the liturgical calendar of the Roman Catholic Church.
The Aztec sun stone, also called the calendar stone, is on display at the National Museum of Anthropology in Mexico City. The calendar consists of a 365-day calendar cycle called xiuhpōhualli (year count), and a 260-day ritual cycle called tōnalpōhualli (day count).