Rare Blue Moon, the last until 2023, wows astronomers (photos)

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The August full moon of the sturgeon rises behind Hortiatis Mountain and the city of Thessaloniki in Greece on August 22, 2021.

The full moon rises behind Hortiatis Mountain and the city of Thessaloniki in Greece on August 22, 2021. (Image credit: Nicolas Economou / NurPhoto via Getty Images)
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A full moon shines over St. Catherine's Church (left) and St. Isaac's Cathedral in St. Petersburg, Russia on August 21, 2021.

A full moon shines over St. Catherine’s Church (left) and St. Isaac’s Cathedral in St. Petersburg, Russia on August 21, 2021. (Image credit: Peter Kovalev / TASS via Getty Images)
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The sturgeon moon appears over Idlib, Syria on August 21, 2021.

The sturgeon full moon appears over Idlib, Syria on August 21, 2021. (Image credit: Muhammed Said / Anadolu Agency via Getty Images)
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The August full moon of the sturgeon rises behind Hortiatis Mountain and Thessaloniki, Greece on August 22, 2021.

The full moon rises behind Hortiatis Mountain and the city of Thessaloniki in Greece on August 22, 2021. (Image credit: Nicolas Economou / NurPhoto via Getty Images)
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The full blue sturgeon moon rises behind the torch of the Statue of Liberty in New York City on August 22, 2021, as seen from Jersey City, New Jersey.

The full blue sturgeon moon rises behind the torch of the Statue of Liberty in New York on August 22, 2021, as seen from Jersey City, New Jersey. (Image credit: Gary Hershorn / Getty Images)
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The full blue sturgeon moon rises behind the torch of the Statue of Liberty in New York City on August 22, 2021, as seen from Jersey City, New Jersey.

The full blue sturgeon moon rises behind the torch of the Statue of Liberty in New York City on August 22, 2021, as seen from Jersey City, New Jersey. (Image credit: Gary Hershorn / Getty Images)
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A 92% illuminated waxing gibbous moon rises above Lower Manhattan and One World Trade Center ahead of the sturgeon full moon and blue moon in New York City on August 19, 2021, as seen from Jersey City, New Jersey.

A 92% illuminated waxing gibbous moon rises above Manhattan ahead of the sturgeon full moon and blue moon in New York City on August 19, 2021, as seen from Jersey City, New Jersey. (Image credit: Gary Hershorn / Getty Images)
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The full moon rises over the city of St. Petersburg, Russia on August 21, 2021.

The full moon rises over the city of St. Petersburg, Russia on August 21, 2021. (Image credit: Peter Kovalev / TASS via Getty Images)
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The Blue Moon is seen at the Independence Monument in São Paulo, Brazil on August 22, 2021.

The Blue Moon is seen at the Independence Monument in São Paulo, Brazil on August 22, 2021. (Image credit: Amauri Nehn / NurPhoto via Getty Images)
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The full moon shines over St. Isaac's Cathedral in St. Petersburg, Russia 21, August 21, 2021.

The full moon shines over St. Isaac’s Cathedral in St. Petersburg, Russia 21, August 21, 2021. (Image credit: Valya Egorshin / NurPhoto via Getty Images)
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A plane flies over the full moon over Ankara, Turkey on August 22, 2021.

A plane flies over the full moon over Ankara, Turkey on August 22, 2021. (Image credit: Metin Aktas / Anadolu Agency via Getty Images)
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Jupiter and Saturn are seen as the full moon rises over a burning hill in the Sequoia National Forest near Lake Isabella in Kern County on August 21, 2021, where the French fire continues to burn in a heavily forested area with 12,037 acres burned and evacuated orders in place for local residents.

Jupiter and Saturn are seen as the full moon rises over a burning hill in the Sequoia National Forest near Lake Isabella in Kern County on August 21, 2021. (Image credit: Frederic J. Brown / AFP via Getty Images)
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The moon rises with Saturn and Jupiter on August 21, 2021 in Korla, China.

The moon rises with Saturn and Jupiter on August 21, 2021 in Korla, China. (Image credit: Xue Bing / VCG via Getty Images)

A rare seasonal “Blue Moon” wowed sky watchers on Sunday (August 22), marking the last time this type of moon will adorn the sky until 2023.

The full moon, also known as the “Sturgeon Moon”, was not called blue for its color. Rather, it is a scheduling rule that occurs in a calendar year with 13 full moons, instead of the usual 12.



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