There was no blue moon in 2008, there will be none in 2010. A blue moon comes once in two to three years. Most calendar months have a single full moon : a complement of twelve a year. There was a first full moon on 2 December 2009, and a second full moon- a blue moon- on 31 December. On New Year’s Eve a blue moon rose in a cloudless sky: the year ended with a thirteenth moon and a partial lunar eclipse as the moon came within the earth’s shadow. On New Year’s Eve my darkened study was flooded with moonlight. There was a keen overnight frost with Arctic weather coming in on a north-east wind. ‘ Brightly shone the moon that night, though the frost was cruel.’