It takes 29 years for Saturn to orbit the sun and only slightly longer than that for Pat Flaherty to close a loop on his coaching career.

Flaherty, 67, is the Rutgers offensive line coach, which is unusual only because it is the same job that he held from 1984-91. That was long before any of his current players were born and even longer before he won two Super Bowl rings as one of Tom Coughlin’s most trusted assistants over 12 seasons with the Giants (2004-15).

“I did a complete circle in my life, which is great,” Flaherty told The Post after a training camp practice in Piscataway, N.J. “People ask me if I fell on my head.”

Flaherty laughs and tells them no. He says he is back because of the relationship he made in 1989 with a graduate assistant coach under his watch who went on to bigger things, like leading Rutgers football out of the doldrums once before, becoming head coach of the NFL’s Tampa Bay Buccaneers and returning to the helm at Rutgers in December 2019 for his own Act II.