Welcome to the Gueranger Blog! You have stumbled across the notebook I use to record my thoughts as I read through Dom Prosper Gueranger's 15-volume set, The Liturgical Year. I do not have any special expertise in liturgy, but I have some general knowledge of Catholic theology and an enthusiasm for Gueranger's magnum opus. Think of it as the Liturgical Year fan site!
In the middle of the entry for December 26, the feast of St. Stephen (Volume 2, Book I, page 235), Gueranger has a "commemoration of St. John"--whose feast is December 27th! Is this a publisher's blooper, or did they really insert a commemoration of St. John the day before his feast?