The same point is made by Hijmans: "It is cosmic symbolism...which inspired the Church leadership in Rome to elect the southern solstice, December 25, as the birthday of Christ ... While they were aware that pagans called this day the 'birthday' of Sol Invictus, this did not concern them and it did not play any role in their choice of date for Christmas." He also states that, "while the winter solstice on or around December 25 was well established in the Roman imperial calendar, there is no evidence that a religious celebration of Sol on that day antedated the celebration of Christmas".