Eclipse of Moon 2018
This January 31 we have been able to observe the second supermoon of this 2018. After the first, which was the morning of January 1 to 2, the night of Tuesday 30 to Wednesday 31 we have enjoyed again this astronomical phenomenon. But the supermoon is only one of the four phenomena that occur at the same time this January 31: there will also be a lunar eclipse, a blood moon and a blue one.
Super moon
The orbit of the Moon is elliptical, and one side (apogee) is about 50,000 km. farther from the Earth than the closest one (perigee). Therefore, throughout the 28 days of the lunar cycle, the satellite is sometimes closer to us than others. The supermoon occurs when the moment of maximum approach is, in addition, the moment in which there is a full moon. At first glance we can appreciate it between 10% and 15% bigger than usual.
blue Moon
A full moon is considered a "blue moon" when two full moons are produced in the same month. Since this month of January we had a full moon at the beginning of the month (another supermoon between January 1 and 2) this second full moon has also been a "blue moon".
lunar eclipse
Also on January 31 a third phenomenon occurs, less common than the supermoon and the blue moon: Earth, Sun and Moon align, giving rise to a total lunar eclipse. The full Moon coincides with the moment when the Moon enters the shadow of the Earth producing an eclipse.
Source:https://elpais.com/elpais/2018/01/30/ciencia/1517298321_409999.html
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