Dr. Bacchiocchi: “From Sabbath to Sunday is a translation and an adaptation of my Italian doctoral dissertation, originally presented at and published by the Pontifical Gregorian University in 1977. The investigation establishes that the change from Saturday to Sunday began approximately one century after the death of Christ, as a result of an interplay of political, social, pagan and Christian factors. The change in the day of rest and worship was not merely a change of names or of numbers, but rather a change of meaning, authority and experience....”