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  • Blue moons are relatively common and appear once every two to three years.

    Blue moons are relatively common and appear once every two to three years. | Photo: ICSTARS: Vic Winter

Published 18 May 2019

"The Moon will not appear blue. Got it? Good,” NASA wrote on Twitter.

For the last time in this decade, a "Blue Flower Moon" will appear Saturday night at approximately 10:21pm (BST), science experts said.

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On Twitter, the National Aeronautics and Space Administration (NASA) wrote, “Since the 1940s, ‘Blue Moon’ has referred to the second full Moon in a month - but tonight’s Blue Moon is from the older definition, which is the third full Moon in a season that has an atypical four full Moons. And please note, the Moon will not appear blue. Got it? Good.”

Despite the colloquial phrase, “Once in a blue moon,” they are relatively common and appear once every two to three years. Still, this blue moon or "May Flower Moon" sighting is exceptional as it will be its last appearance for the decade until August 22, 2021.

Rome’s astrophysicist and the director of the Virtual Telescope Project, Gianluca Masi, told CNN, “[The moon] will put [on] its usual great show and we will show the moon rising above the legendary skyline of Rome … Every two to three years we have 13 full Moons within a year. This way, we can have four full Moons during a given season or two full Moons in a given month."

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