the Sunday after Pentecost, in honor of the Trinity. It falls between mid-May and mid-June.
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Uses:
when the thought struck me: 'To-morrow's Trinity Sunday; how is it they are not decking the gates and the fence with green? Something's wrong,' I thought. I went over to them. I peeped in, and there he was, sitting on the floor in the middle of the room, his eyes staring like a drunken man's, the tears streaming down his cheeks and his hands shaking;
Anton Chekhov. The Witch and other stories
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"I'm not going to be tried. I shan't murder anybody, and I've no need of it. Well, I tell you what," he went on, flying off again to a subject quite beside the point, "our district self-government and all the rest of it— it's just like the birch branches we stick in the ground on Trinity Day, for instance, to look like a copse which has grown up of itself in Europe, and I can't gush over these birch branches and believe in them."
Leo Tolstoy. Anna Karenina (Translated by Constance Garnett)