The law of Pagume 6 is a rule that brings three categories of four years. Category one is the first year that New Year begins on Meskeram 1 and ends on Pagume 5 in the Tropics, when equal number of days of the year (September 12 to September 10) recurs in the Temperates. Category two is there are two years (the 2nd and 3rd) which have similar beginning and ending days. Each year begins on Meskeram 1 and ends on Pagume 5 in the Tropics, when the same number of days of the year (September 11 to September 10) recurs in the Temperates. Category three is the leap year that begins on Meskeram 1 and ends on Pagume 6, when an equal number of days of leap year (September 11 to September 11) recur in the Temperates. Category three is the year of the day Pagume 6. Therefore, the day Pagume 6 is the greatest day of our universe, because it is made from the sum of four quarter days and does recur and included once in every four years. This means that the complete cycle of three categories of four years ends when the day Pagume 6 ends in the Tropics, when 11 September does recur and ends in the Temperates. Moreover, the day Pagume 6 is the greatest days of our universe because of the fact that both man made clock and calendar do not know it over 1460 days. As a result both manmade clock and calendar do only know Pagume 6 once in every four years or at the day when the total number of days of four years is equal to 1461. Three categories of four years consist of 3 of 365 days and one of 366 days. Pagume, in every three categories of four years, has 21 days (=3 of 5 days and 1 of 6 days). . The sum of 3 of 5 and 1 of 6 is equal to 21 days. Ethiopian calendar and Gregorian calendar are compared. They are compared because each of them are made from the image of sun and earth. Ethiopian calendar is the image of Tropics and sun, when the Gregorian calendar is the image of Temperates and sun. year is the number of days that takes the earth to make one complete round around the sun, and it takes about 365.25 days. Man makes a year to have 365 days for three consecutive years and 366 days once in every four year.