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Both expressions have more or less the same meaning; Juline.
Once in a while = every now and then = from time to time = not very often = occasionlly.
Once in a blue moon = very rarely
I think the latter is nearly the same as never, like: when pigs fly = when Philip Cheeter has had it with women.
A blue moon is a second full moon in the same calendar month. Yesterday we had a full moon. We'll have a blue moon on next August 31. That's worth knowing, isn't it, Juline?
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