Hastings' Dictionary of the Bible (1898)
TRUMPETS, FEAST OF. This feast - enjoined Num 29:1-6; Lev 23:24 - was the New Year's day of the civil year, coming on the first of Tisri (October), and was further called by the Rabbins "the birthday of the world," because in Tisri the late fruits were gathered and seed was sown. It was characterized by the use of both the straight trumpet and the cornet in the temple, by the blowing of trumpets everywhere, unless the festival fell on a Sabbath
(in this case no trumpets were blown outside of the temple), and by the offering of a young bullock, a ram, and seven first-year lambs, with meat-offerings and a kid for a sin-offering in addition to the daily sacrifices and the eleven victims of the new moon, the ordinary feast of the first day of the month. It was one of the seven days of holy convocation. The feast differed from the other feasts of new moon, which also had their
trumpet-blowings over the burnt-offerings, by its being a day of rest and service.