The old saying of ‘once in a Blue Moon’ rang true, as this celestial event took place around the globe last Friday evening.
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A Blue Moon hasn't been seen in several years.
If you were lucky enough to have stood outside on Friday night, you would have seen the second full moon of July, which is commonly referred to as a "blue moon".
The US Naval Observatory in Washington describes it as, " ... the third full moon in an astronomical season in which four full moons fall".
The phenomenon appears only once every three years, according to the National Oceanic and Atmospheric Administration.
But is the moon actually blue? No. It appears grey or silver like any other full moon. (Sometimes full moons can appear red or orange due to unusual atmospheric conditions, such as nearby wildfires.)
The next Blue Moon will be in January, 2018.
