The Flower Full Moon will be blu-ish

The first Scot in space on his 50-year mission to become an astronaut

The first Scot in space on his 50-year mission to become an astronaut

It's worth bearing in mind that a blue moon is never actually blue - you might be disappointed if you're expecting to see Earth's only natural satellite turn a different shade. It only looks blue if there are ash or dust particles in the air, but it'll still look cool.

There are two definitions of a blue moon.

It's all about the lunar calendar.

The correct definition of a blue moon-or an "astronomical full moon"-is where an astronomical season has four full moons". The full phases of the Moon, in most cases, originate in the naming traditions of Native American tribes in northeast America.

Seasonal Blue moons are said to occur once every two to three years.

This weekend's full moon may be called a few other nicknames in addition to a blue moon.

Despite its nicknames, Saturday night's moon will appear like other full moons throughout the year.

Amy Nieskens of the Old Farmer's Almanac guide explained: "May's Full Moon is known as the Flower Moon because flowers spring forth in abundance this month". Occasionally, however, there will come a year when there are 13 full moons during a year, not the usual 12.

I'm all for an exciting "blood moon" (aka: a total lunar eclipse) or even a just slightly interesting "supermoon" when the full moon looks a smidge bigger in the sky, but there is absolutely no reason to get excited about this Saturday's "blue moon". This relatively rare celestial event, involving the third full moon in an astronomical season with four full moons, will not happen again until August 2021. May 18 will be the third full moon of the season and the blue moon. This spring already had full moons on March 20 and April 19, and two more are coming, one on May 18 and one on June 17. Eastern time, so it will look almost full on Friday night, May 17, completely full on Saturday night, and almost full on Sunday night, May 19.

And for those who don't have a chance to get outside to study the sky, the Weather Channel will be broadcasting a livestream of the moon beginning at 9:30 p.m. Look to the east-southeast to see the full moon rising at the horizon.

According to, the last time we had a blue moon based on the "four full moons in a season" rule was in May 2016.

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