Tubal anastomosis: once in a blue moon?

Tubal anastomosis: once in a blue moon?
Reflecting imparts the pleasant memory of something special, notable and memorable. In the past century, “blue moon” has been used to denote the moment where a second full moon occurs within a calendar month, which happens once in three years. However, two blue moons in a year is quite rare. Just this year, we had the unique opportunity to see blue moons in both January and March. Owing to the metonic cycle, we will not experience two of these in the same year again until 2037. As with the blue moon, we ask whether tubal anastomosis has become too infrequent of a distinctive event to be worth remembering, offering, or teaching?
Source: fertstert.org