“I know what yer thinkin’, punk…

“The evening of the 20th by all rights oughtta be the First Vespers of St. Thomas the Apostle, a second class universal double feast. But yer thinkin’ maybe–just maybe–the Second Vespers of a second class feria in Sapentia-tide just might take it…and you can get away with usin’ the ‘O’ antiphon with the Magnificat instead of the one appointed for St. Thomas…

“Ya gotta ask yerself a question: do I feel lucky? Well, do ya–punk?”

(The answer, of course, is that the antiphon for the Magnificat is that appointed for St Thomas [Thomas, because thou hast seen me, thou hast believed; * blessed are they that have not seen, and yet have believed] However, the “O” antiphons appear on the 20th and 21st as commemorations—after the collect of the day, with their versicle & response [if you’re using them] and followed by the collect of the Third Sunday of Advent.)