A blue moon is the second full moon in a month and this will happen New Year’s eve. So expect to see a bright moon tonight.

The last full moon happened in December 2 and that’s why the December 31 full moon is now considered a blue moon.

The New Year’s Eve blue moon can be seen in the United States, Canada, Europe, South America and Africa. For those in Australia and Asia, the full moon does not show up until New Year’s Day, making January a blue moon month for them.

A full moon occurs every 29.5 days, and most years have 12. On average, an extra full moon in a month or a blue moon occurs every 2.5 years.

The last time this happened was in May 2007. New Year’s Eve blue moons are rarer, occurring every 19 years. The last time was in 1990; the next one won’t come again until 2028.

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