December

December is the twelfth and final month of the year in the Julian and Gregorian calendars.

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.

Later, the months of January and February were created out of the monthless period and added to the beginning of the calendar, but December retained its name.

[1][2] In Ancient Rome, as one of the four Agonalia, this day in honour of Sol Indiges was held on December 11, as was Septimontium.

In the Northern hemisphere, the beginning of the astronomical winter is traditionally 21 December or the date of the solstice.