The Roman Senate named the month of July after Julius Caesar to honor him for reforming their calendar, which had degenerated into a chaotic embarrassment. Bad calculations caused the months to drift wildly across the seasons—January, for example, had begun to fall in the autumn. Corrupt calendar officials sometimes lengthened the year so that favored politicians could remain in office longer or they shortened a year to limit another politician's tenure in office.
The calendar we now follow is called the "Julian" or "Roman" calendar made up of 12 months, 365 days and a leap year every four years when an additional day is added to keep the calendar synchronized.
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