St Demetrius Memorial Saturday 2026 is on 7 November 2026 · Saturday · in 40 days
the Nativity Fast1 January – 6 January
the season after Pentecost7 January – 22 February
Great Lent23 February – 4 April
Holy Week5 April – 11 April
the Pentecostarion (Pascha to Pentecost)12 April – 31 May
the season after Pentecost1 June – 7 June
the Apostles’ Fast8 June – 11 July
the season after Pentecost12 July – 13 August
the Dormition Fast14 August – 27 August
the season after Pentecost28 August – 27 November
the Nativity Fast28 November – 31 December
How the date is found
St Demetrius Memorial Saturday is 209 days after Easter in the Orthodox calendar. Easter is the first Sunday after the first full moon on or after 21 March, computed by the Julian rule (Meeus’s algorithm, no lookup table).
Easter: Meeus/Jones/Butcher and Meeus’s Julian algorithm (Jean Meeus, Astronomical Algorithms, 1991). Feast offsets as in the General Roman Calendar and the Orthodox Triodion/Pentecostarion.