It is useful to know there are 3 categories of 4 years in the solar year system. Category one or A is the first year that new year begins on 1 Meskeram, when September is 12 in the Gregorian calendar. Category year two or B is two years in which each year has similar beginning and ending days. This means that in category year two, each year begins on 1 Meskeram, when September is 11 and ends on Pagume 5, when September is 10. Category year three or C is the leap year that ends on Pagume 6, when September is 11. The day Pagume 6 is registered on the Ethiopian calendar, when September is 12 in the Gregorian, once in every four year. Therefore, it is the source of 3 categories 4 years. When Pagume 6 ends on a leap year, the first category year begins on 1 Meskeram, when September is 12. Category A and B are year of 365 days each, and Category C is year of 366 days or leap year. Therefore, the process of 3 by 4 cyclical years is continues.