Saint George's Day of Spring in the context of George's Day in Autumn

George's Day in Autumn, or Saint George's Day, is one of two feasts of Saint George, celebrated by the Russian Orthodox Church (9 December [O.S. 26 November]), the Serbian Orthodox Church (16 November [O.S. 3 November]), and the Georgian Orthodox Church (23 November [O.S. 10 November]), the other being Saint George's Day of Spring (6 May [O.S. 23 April]).