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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 is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.
The calendar year has begun in January and ended in December since about 450 BC according to Ovid or since about 713 BC according to Macrobius and Plutarch (see Roman calendar). Julius Caesar did not change the beginning of either the consular year or the calendar year.
December is the twelfth and final month of the year in the Julian and Gregorian calendars. Its length is 31 days. December, from the Très Riches Heures du duc de Berry. 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.
France adopted the Gregorian calendar in December 1582. France changed New Year's Day to 1 January from 1564. Previously, France had counted various days as New Year's Day: Christmas , Easter-eve, 25 March (Lady Day).
The General Roman Calendar is the liturgical calendar that indicates the dates of celebrations of saints and mysteries of the Lord (Jesus Christ) in the Roman Rite of the Catholic Church, wherever this liturgical rite is in use. These celebrations are a fixed annual date, or occur on a particular day of the week.
In the Northern Hemisphere, this is the December solstice (December 21, December 22, or December 23) and in the Southern Hemisphere, this is the June solstice (June 20, June 21, or June 22). Although the winter solstice itself lasts only a moment, the term also refers to the day on which it occurs.
Dates in December occur in the preceding Gregorian year. Dates in bold are Sundays. The Pax years run sequentially down each column (from second-left to right), and a new column is begun when the year would need to go further up the column.
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.
December (from Latin decem, "ten") or mensis December was originally the tenth month of the Roman calendar, following November (novem, "nine") and preceding Ianuarius. It had 29 days.