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ASTRONOMICAL PHENOMENON
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Blue moon ends this Sunday, May 2026

The year is usually 12 full moons, but every year there is a full moon 13 in the sky, which the English call "Blue Moon," which will happen this May 31.
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Full moon in the Basque Country. Photo: EITB

For generations, society has been organized in the world by looking at the moon. It has been looked at to measure time, when to sow, when to harvest. It is key to the earth, among the peasants, and essential in the sea, in navigation, among the seamen.

A moon lasts 29.53 days, and since a year has 365.24 days, there are 12 moons each year, so that in the "Gregorian calendar" most used in the world to measure time, there are officially 12 months and 12 full moons a year.

The last time it happened was in 2023, and this year, in May, the curious thing will be repeated: on the 1st of May, at the beginning of the month, the first full moon occurred; and this 31st, the last day of the month, we shall again have a full moon in the sky.

This particular moon, which appears every two or three years, is called a blue moon, not because it is seen in blue, but because in 1528, when the phenomenon was first written down, it was defined as "Blue Moon."

There are many myths and legends about this phenomenon: that looking at the blue moon brings good luck, that you have to use it to make desires and demands, that it serves to close past, problems, cycles, etc.

If you have faith, today is a good night for it.

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