Examples
“In my childhood, there was no ice-cream at home – we had ice-cream wafer sandwiches once in a blue moon – so seeing a Cornish ice-cream seller was the highlight of our summer holidays.”
“While you’re not restricted from enjoying these items once in a blue moon, they should be avoided as much as possible on a daily basis.”
“My mother had an aunt who lived in Shawlands, and maybe once in a blue moon we would get the bus into the city to visit her.”
According to NASA, the moon can appear blue due to light scattering from particles in the air. How often this happens depends on the environmental conditions.
Another definition of a blue moon is a second full moon in a calendar month. This happens approximately every 2.5 years.
Photo credit: John Sonderman (Creative Commons)
Updated Saturday 29 February 2020
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