April 19 - Eastern Orthodox liturgical calendar - April 21
All fixed commemorations below are observed on May 3 by Eastern Orthodox Churches on the Old Calendar. [note 1]
For April 20th, Orthodox Churches on the Old Calendar commemorate the Saints listed on April 7 .
Mar. 31 - Eastern Orthodox liturgical calendar - Apr. 2
April 2 - Eastern Orthodox liturgical calendar - April 4
April 3 - Eastern Orthodox liturgical calendar - April 5
April 5 — Eastern Orthodox liturgical calendar — April 7
April 10 - Eastern Orthodox liturgical calendar - April 12
April 11 - Eastern Orthodox liturgical calendar - April 13
April 14 - Eastern Orthodox liturgical calendar - April 16
April 16 - Eastern Orthodox liturgical calendar - April 18
Apr. 23 - Eastern Orthodox liturgical calendar - Apr. 25
April 25 - Eastern Orthodox liturgical calendar - April 27
April 17 - Eastern Orthodox liturgical calendar - April 19
April 18 - Eastern Orthodox liturgical calendar - April 20
April 20 - Eastern Orthodox liturgical calendar - April 22
January 10 - Eastern Orthodox liturgical calendar - January 12
January 20 - Eastern Orthodox liturgical calendar - January 22
January 21 - Eastern Orthodox liturgical calendar - January 23
January 23 - Eastern Orthodox liturgical calendar - January 25
January 24 - Eastern Orthodox liturgical calendar - January 26
January 27 - Eastern Orthodox liturgical calendar - January 29
April 6 - Eastern Orthodox liturgical calendar - April 8
Greek Sources
Russian Sources