Why is the Super Bowl on a Sunday?

If there is one constant in life, it's that the Super Bowl will always be on a Sunday and people will always talk about how they wish it was on Saturday.
The average ticket price on one secondary-market site Monday morning was nearly double the final average price for last year's Super Bowl.

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Why is the Super Bowl played on the second Sunday of February? I remember when it used to be the last Sunday in January. - Quora

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Why is the Super Bowl always on Sundays?

Why is the Super Bowl during the nighttime, not during the daytime, since it falls on a Sunday? - Quora

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