Tarot of Marseilles Thirteen, that dreaded number, is considered unlucky by many, but why? The number is associated with the moon in all cultures, because there are approximately 12.4 lunations per solar year. This means that there are always twelve lunations in a year, from which we derive our twelve months, but there is one lunation which straddles the old year and the new year. Thirteen therefore represents an inbetween time. In the Anglo-Saxon calendar, the number of full moons was counted from winter solstice to winter solstice. Most of the time there would be twelve full moon but sometimes there would be thirteen. If there were thirteen then an extra month of the year was inserted at the time of the summer solstice, making the summer a whole month longer than usual. The Summerland is a concept of an afterlife paradise where good souls live inbetween incarnations. This concept was devised in the 19th century by a Spiritualist called Andrew Jackson Davis. The concept of a Summ...