Blue Moon This Week: See the Last One Until 2018

The next blue moon will not occur for a few years, so make sure to catch the Blue Moon on Friday, July 31.

A Blue Moon is a second full moon within the same calendar month. The first full Moon in July was on the 2nd, according to astronomers.

The Moon will turn full on July 31 at 6:43 a.m. Eastern Daylight Time.

The next blue moon will be an even rarer event.

The next time we will see two full Moons in a single month will come in 2018, according to the Farmers’ Almanac, in January and again in March that year. Because of their timing coinciding with a leap year, both January and March of 2018 will have a blue moon. The last time that happened was 1999.