The Ethiopian calendar system brings three categories of four years each: Category A begins a day late, Category B has the second and third years beginning and ending on the same days, and Category C is the fourth year that ends a day later and is considered a leap year, with all categories forming a repeating cycle to account for the tropical year being approximately 365.25 days.

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