“Rare” Lunar Occurrence

A reader sent me the photo here, noting: A very rare occurrence, the sun and the moon are visible at the same time in the horizon. This phenomenon is known as Selenelion. 
Comments include:
Absolutely amazing
Me: I wouldn’t call it rare; it’s impossible.  Looks like someone didn’t learn about the phases of the moon like (I thought) everyone did in 5th or 6th grade.
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