A blue moon is rising on 31st May 2026. what does this mean and how will it affect us? Does it cause harm? Why is it blue?
While not actually blue in colour, it was interpreted as this when the eruption of volcano Krakatoa erupted in 1883. Another volcano, Mount St Helens erupted in 1980 that made the moon look blue. While the moon turned blue, the sun turned green and this phenomena lasted for months.
Across the world, people referred to the days of the green sun and blue skies were turned red, while the nights had a sapphire moon (not to be mistaken with the Bath and Bodyworks perfumes). These strange celestial colours of moon, sky and sun lasted for up to two years.
This eruption in 1883 happened in Indonesia. It was so loud that it burst eardrums of sailors 40 miles away from the volcano. But this event has nothing to do with the rare "once in a blue moon" occurrence.
Folklore of a blue coloured moon ranges from omens of plague, stories of grief, loss and broken hearts. This applies to the colour blue, and also a second full moon within the same month. Modern witches, Wiccans, pagans and other spiritual beliefs have different ideas of a blue moon and what it means. They see it as a positive time for growth, inspiration, divine feminine, fertility, spell working and esoteric inner wisdom.
Werewolves, in folklore, are believed to be more stronger and powerful during a blue moon! They can be faster and much more dangerous. It's believed they can even be cured during a blue moon.
More on Krakatoa eruption of 1883 at IFL Science.
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