July is named for Julius Caesar, who reorganized the previously chaotic Roman calendar with the help of Alexandrian sages to form the Julian calendar. This new calendar was instituted in the year 46 B.C.E., known as the year of confusion after the chaos caused by changing from one calendar to another. The Julian calendar became the main calendar in the West for the next 1600 years. It was current in Britain until 1752. When the new Gregorian calendar was set up, Julius's name remained on the seventh month in commemoration of his work. July 3rd begin the 'dog days' of summer, ruled by the Dog Star, Sirius. Traditionally, these are the hottest days of the year.