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January is the first month of the year and one of seven Gregorian months with the length of 31 days. January begins (astrologically) with the sun in the sign of Capricorn and ends in the sign of Aquarius. Astronomically speaking, the sun begins in the constellation of Sagittarius and ends in the constellation of Capricornus. January is named for Janus (Ianuarius), the god of the doorway; the name has its beginnings in Roman mythology, where the Latin word for door (ianua) comes from - January is the door to the year.
Traditionally, the original Roman calendar consisted of 10 months, totalling 304 days, winter being considered a monthless period. Around 713 BC, the semi-mythical successor of Romulus, King Numa Pompilius, is supposed to have added the months of January and February, allowing the calendar to equal a standard lunar year (355 days). The first day of the month is known as New Year's Day. Although March was originally the first month in the old Roman Calendar, January assumed that position beginning in 153 BC when the two consuls, for whom the years were named, began to be chosen on January 1. The reason for this shift of the new year into the dead of winter was to allow the new consuls to complete the elections and ceremonies upon becoming consuls, and still reach their respective consular armies by the start of the campaigning season.
From http://en.wikipedia.org/wiki/January
