The Ethiopian Calendar is a unique calendar system used primarily in Ethiopia and by the Ethiopian Orthodox Church. It consists of 13 months: 12 months of 30 days each and a 13th month, called Pagumē, which has 5 days in a common year and 6 days in a leap year. The calendar is approximately 7-8 years behind the Gregorian Calendar, which is widely used around the world. The Ethiopian New Year, known as Enkutatash, is celebrated on September 11 (or September 12 in a leap year) and marks the beginning of the year in this calendar. The calendar is based on the Coptic Calendar, which has its roots in ancient Egypt, and it reflects the rich cultural and religious traditions of the Ethiopian people.