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Hi, who came up with the idea

Hi, who came up with the idea of Leap Year, and that it should be in February and no other month like July? I understand that there are different days in each months are, 31, 28/29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 days/month. Instead of a leap year, the days in August could be 31, then the series goes on......