 
 December 27 - Eastern Orthodox liturgical calendar - December 29
All fixed commemorations below are observed on January 10 by Orthodox Churches on Old Calendar. [note 1]
For December 28th, Orthodox Churches on the Old Calendar commemorate the Saints listed on December 15 .

May 26 - Eastern Orthodox Church calendar - May 28

June 15 - Eastern Orthodox Church calendar - June 17

January 3 - Eastern Orthodox liturgical calendar - January 5

January 7 - Eastern Orthodox liturgical calendar - January 9

January 28 - Eastern Orthodox liturgical calendar - January 30

December 16 - Eastern Orthodox liturgical calendar - December 18

December 17 - Eastern Orthodox liturgical calendar - December 19

December 2 – Eastern Orthodox liturgical calendar – December 4

December 3 - Eastern Orthodox liturgical calendar - December 5

December 4 - Eastern Orthodox liturgical calendar - December 6

December 6 - Eastern Orthodox liturgical calendar - December 8

December 9 - Eastern Orthodox liturgical calendar - December 11

December 10 - Eastern Orthodox liturgical calendar - December 12

December 11 - Eastern Orthodox liturgical calendar - December 13

December 14 - Eastern Orthodox liturgical calendar - December 16

December 22 - Eastern Orthodox liturgical calendar - December 24

December 26 - Eastern Orthodox liturgical calendar - December 28

December 28 - Eastern Orthodox liturgical calendar - December 30

December 29 - Eastern Orthodox liturgical calendar - December 31

December 30 - Eastern Orthodox liturgical calendar - January 1
Greek Sources
Russian Sources