The unit of time that measures one rotations of earth is the day. The unit of time that measures one revolution of the earth is the year. In one year Earth does make 365.25 rotations. That is one year consists of 365.25 days. But for the best use of human being  men make a year to be 365 days for three consecutive years and 366 days once in a leap year. Therefore there are three categories of four years. Besides, men do make a year to be divided into 12 calendar months. Thus,365 days/12 months =30 days and remainder 5; 366days /12 months=30 days and remainder 6. The remainder 5 or 6 days is called Pagume.

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