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When, in church history, was the Sabbath  changed to Sunday and why?

Saturday was replaced by Sunday during the apostles' time, as it is clear from (Acts 20:7) "And upon the first day of the week (Sunday), when the disciples came together to break bread (communion), St Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight." It is replaced by Sunday because it is the day of Holy Resurrection.