The Ranking of Feasts

By the ranking of a Feast is meant its relative importance.  The rank thus determines which Office is said when more than one Office occurs on the same day.  It is also used to determine when First Vespers of a Feast is to be said, as well as the order of commemorations at Lauds and Vespers.

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Certain Feasts have Octaves, that is, an extension of the Feast over the following week.  Octaves may be privileged, common or simple, as follows: