I notice that the guide for Christian Prayer’s (one volume hours) evening prayer seems to direct to the following day, e.g. evening prayer last night, Dec 31, referenced the evening prayer for Jan 1’s Solemnity.
Does the new day for hours begin at sunset, as with the Orthodox church? What day should I be looking for when I say evening prayers, the evening of the calendar day I’m in, or the following day? So tonight, should I say the Jan 1 evening prayer again, or Friday’s evening prayer? Or the other evening prayer (II) for Jan 1?