Why is the Sabbath on Sunday now?

We go to Mass on Sunday, I have a friend that asked me why do we go on Sunday and not Saturday. Please help me to answer his question.

The following link should help you better understand the Church’s teaching on keeping the Sabbath day holy. If you have any further questions, please contact Catholic Answers directly.

Recommended Reading:

[LIST]
*] Where is the Sunday Mass obligation in the Bible?
*] Do Catholics observe the Sabbath?
*]Why do Catholics worship on Sunday?
*]Seventh-Day Adventism
*]Sabbath or Sunday?
*]From Sabbath to Sunday by James P. Guzek
[/LIST]

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit www.catholic.com.