5:52   The Coptic Orthodox Calendar and Feasts 3:25   Orthodox (Coptic) Christmas vs Catholic/Protestant Christmas - Why Different Dates? 5:52   13 Months? Inside Egypt’s Unique Coptic Calendar 9:42   Coptic calendar 10:37   Discover the Origin of the Ethiopian Calendar! The Calendar with 13 Months 10:18   How I set up a NEW HOMESCHOOL YEAR using the Coptic calendar - Mom of 6 - plan with me 7:31   Calendar to define the Easter and the changeable feasts for 10000 Coptic years - EN 5:55   Calendar to switch between the Coptic and the Gregorian calendars for 8000 years - EN 5:09   Coptic Calendar 9:45   Coptic Calendar & Months in Egypt