May those for whom the moon will be as white as usual, next Saturday, be reassured: they will not suffer from color blindness.
A blue moon refers not to a color, but rather to the astronomical phenomenon that at regular intervals, two full moons appear in the same month.
, Jean David, president of the Corporation d’astronomie de Val-Bélair.
A first full moon shone on the night of October 1. A second will appear on the 31st.
2020 will therefore have this quality: that of offering 13 full moons rather than the usual twelve.
Blue moons occur every 2 and a half years, recalls the NASANational Aeronautics and Space Administration. On the other hand, it is much rarer for the phenomenon to appear during the night of fear.
The next time a blue moon rises on Halloween, it will be in 2039.
The moon, in the long term, operates on a 19-year cycle, explains Jean David. If we go back 19 years, we will probably find a full moon in the same position, on October 31st.
What makes the event exceptional this year is that the whole planet will be able to admire this blue moon on October 31.
The moon is always full for everyone, underlines Jean David, but it is moving. It takes 12 hours for it to move from one hemisphere to another; this probably means that she will get up early enough to have time to be full everywhere on the planet during the same day.
The last time the whole globe was able to enjoy such a spectacle was in 1944, says the NASANational Aeronautics and Space Administration.
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