gregorian

Of or relating to a person named Gregory, especially any of the popes of that name.

Of or pertaining to the Gregorian calendar.

An average Gregorian year is 365.2425 days.

Of or relating to James Gregory (mathematician), inventor of the Gregorian telescope.

A member of the Brotherhood of Saint Gregory.

Alternative letter-case form of Gregorian.

Also, the play now opens and closes with a chant (definitely not gregorian, as that may have required some research) of Kyrie Eleison four times, not three, which is just enough to confound any Catholic in the audience and make Brecht roll over in his grave and puke.