The Gregorian calendar is the one most used nowadays. It is named after Pope Gregory XII who introduced it in 1582. There is a leap year every four years. This means that the year corresponds closely with the astromonical year (365.24219 days) so that it is just one day out every 3,300 years. Up until 1753, the calendar used in Britain was the Julian Calendar. It was 365.25 days long, which was fractionally too long and the calendar over time fell out of line with seasons and thus was less accurate than the Gregorian Calendar. In 1752 Britain decided to abandon the Julian calendar in favour of the Gregorian. By doing so, 3 September instantly became 14 September. Many people believed their lives would be shortened. They protested in the streets, demanding "Give us back our 11 days!"
From http://www.woodlands-junior.kent.sch.uk/customs/calendars/index.htm
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