An analytical review of whether Saturday can be substantiated as the 'Sabbath Day.' Reviewing old Jewish books and manuscripts that clearly show the 'Sabbath Day' shifted its day with the change over to a New Year. The book also addresses two errors about Sunday worship - Firstly it was instituted by the Roman Catholic Church. And, Secondly, it was an extension of sun worship in the Roman Empire. The book takes a position based on the Apostle Paul's writings to the Romans in Romans 14: 6 that he that regards a day, regards it unto the Lord.