Once in a Blue Moon Dive #2 – Milwaukee Carferry (individual sign-ups)

Milwaukee Carferry

A 318 foot steel railroad car ferry was loaded with 27 box cars and 52 passengers. This is a popular dive destination as there are plenty of things to explore such as railcars, cars, or bath tubs. Penetration is possible for the trained and experienced.  Read more…

What Does “Once In A Blue Moon” Mean?

Once in a blue moon is a common idiom which indicates that something happens only very rarely, seldom, only once in a long period of time; almost never.

Note: In some places, if there are two full moons in a calendar month, the second is called a `blue moon’. This is rare.

History of Expression

The ‘moon’ in this expression does, in fact, refer to the real moon when it is full. There are generally three full moons in a season, although sometimes there may be four. The third full moon visible on the rare occasions that there are four in a season is known as a ‘blue moon’. But why blue?

The word derives from the Old English word ‘belewe’, which had two separate meanings. One of them was ‘blue’. The other was ‘betrayer’.