Six circuits (once each day) = 6 periods of Gospel Age (Ephesus Philadelphia). An angel blew a trumpet (announced a special message) in each period/Church. (In all, there are 7 churches/trumpets/messages/messengers for 7 periods.) In the Joshua type, 7 priests blew 7 trumpets. Seven priests = 7 messengers; 7 trumpets = Word of God; sound = message (7 of them).