That’s our 13th full moon of 2020 shining up there as the year ends – Washington Post

As an object of fascinated contemplation, as the source of dreams and the inspiration for song and story, the moon, particularly at maximum luminosity, may be welcome without explanation as many times a year as it may appear.
But in a mundane, mechanistic sense, a years 13th full moon may be explained by citing the different number of days in a lunar month and in a calendar month.
The time between full moons is a little less than 30 days, making it sometimes possible to fit 13 full moons into 12…

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