3 categories of 4 years

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Years of the set of category year one is { 0,4,8,...,1996,2000,2004,...}
Years of the set of category year two { 1,5,9,...,1997,2001,2005,...} and {2,6,10,...,1998,2002,206,...}.
Years of the set of category year three is { 3,7,11,...,1999,2003,2007,...}

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3 categories of 4 years

  1. 1. Ethiopia’s calendar is neither ancient nor newbecause it is an eternal image of tropics and sun. Therefore, it brings three categories of fouryears.Category A is the first year that begins a day late. NewYear begins on Meskeram 1, when September is 12.Category B is the second and third years that each of themhas similar beginning and ending days. New Year of eachbegins on Meskeram 1, when September is 11; and ends onPagume 5, when September is 10.Category C is the fourth year that ends by a day more. Thiscategory three is traditionally known as leap year. This yearbegins on Meskeram 1, when September is 11 and ends onPagume 6, when September is 11.Categories A and B are subset of four years that each year has aperiod of 365 days. And category C is a subset of four years that has a period of 366days.

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