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Blue Moon...

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620977.  Fri Oct 02, 2009 1:14 pm Reply with quote

The third full moon in a season with four full moons is called a blue moon, as described in the Maine Farmer's Almanac. Until recently it was commonly misunderstood that the second full moon in a month was the blue moon. However, it was recently discovered by Sky & Telescope Magazine and reported on NPR that the interpretation of a blue moon as the second full moon of the month was erroneously reported in an issue of Sky & Telescope dating back to 1946 and then perpetuated by other media.

620997.  Fri Oct 02, 2009 1:56 pm Reply with quote

So, "once in a blue moon" is actually a fairly common occurence?

That's very interesting! :)

621092.  Fri Oct 02, 2009 3:15 pm Reply with quote

Kryt0n wrote:
the Maine Farmer's Almanac..

Another Mainer on QI?

621145.  Fri Oct 02, 2009 4:30 pm Reply with quote

A blue moon in fact happens approximately once every 2 years.

See post 181698 and the Sky and Telescope website.

636625.  Fri Nov 13, 2009 11:50 am Reply with quote

How does that work out? I seem to have missed something. A year has 13 full moons, so there must be one season with 4 full moons (or more if the seaons aren't considered equal length) every year.

Edit: It seems I thought that the lunar cycle was 28.5 days rather than 29.5, so the spread is larger and less often.

649835.  Fri Dec 25, 2009 11:11 am Reply with quote

I won a fiver on a bet with this misinterrpretation because i saw it here


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