Almost forty years, the two phenomena did not coincide. The reason for calling it the strange name is the natural satellite on Earth.
Autumn in the southern hemisphere and spring in the northern hemisphere do not come alone this year: they are accompanied by moon XXL, the third and last of the year, the "red supermoon".
This phenomenon is named in connection with the defrosting that occurs in spring in the northern hemisphere, when the rains appear on the surface of the earth.
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The coincidence of equinox with equinox is a phenomenon that has not happened since 1981, that is 38 years ago. The moment of greatest visibility of the phenomenon will occur immediately after the official change of the station, which is happening today 21.58 GMT (18.58 Argentine time).
Astronomers speak "Supermoon" when the moon is full and the nearest point on Earth – the perigee – it looks 14% larger and 30% brighter than the usual Full Moon.
For the next full supermoon we will have to wait one year, until March 2020.