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.