The term “blue moon” comes from the traditional agricultural naming of the full moons throughout the year.
The 12 full moons we see each year are named according to their relationship with the equinoxes and solstices. The names vary in different regions, but well-known examples are the harvest moon, which is the first full moon after the autumnal equinox, and the hunter’s moon, which is the second full moon after the autumnal equinox. Similarly the Lenten moon, the last full moon of winter, is always in Lent, and the egg moon (or the Easter moon, or paschal moon), which is the first full moon of spring, is always in the week before Easter.
By this system there are usually three full moons between an equinox and a solstice, or vice versa. However, because the lunar cycle is slightly too short for there to always be three full moons in this stretch of time, occasionally there are four full moons. When this happens, to ensure that the full moons continue to be named correctly with respect to the solstices and equinoxes, the third of the four full moons is called a blue moon.
There are seven blue moons in every 19 year period. The last blue moon was on 21 November 2010, and the next will be on 21 August 2013.
[Aidan Copeland in “The Last Word”, New Scientist, 1 October 2011]


Even the cats were different, and Aubrey could recall when ‘the common English Catt was white with some blewish piednesse sc gallipot-blew, the race or breed of them are now almost lost’ … Aubrey says that Archbishop Laud had been ‘a great lover of Catts. He was presented with some Cypruss-catts, our Tabby-catts, which were sold at first for 5li a piece. This was about 1637 or 1638’. Tabbies are still called ‘cyprus cats’ in Norfolk.


Two-thirds of us tilt our heads to the right when we kiss, and it’s not correlated with handedness.