Q: At what side of the altar the book of the gospels is supposed to be placed when entering in the procession? At the front side immediately as the deacon reaches the altar or the deacon has to go around the altar and place it at the side facing the assembly?
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A: There is no stated preference about where the book goes, probably because sanctuaries are so different. It can be placed either way.
Here’s a previous post with another previous post: https://paulturner.org/book-of-gospels-on-the-altar/