A lunar eclipse happens when the moon passes through Earth's shadow as our planet goes around the Sun. This kind of event does not happen every year. The last lunar eclipse seen in the United States took place in September 2015.
The eclipse this weekend is special. The moon will be a little closer than it normally is to the Earth. For this reason, it will appear brighter than usual. Such a moon has come to be called a supermoon.
Astrophysicist Patrick Hartigan told the Associated Press, "It not only is a supermoon and it's a total eclipse, but the total eclipse also lasts pretty long. It's about an hour." Hartigan works at Rice University in Texas.
If skies are clear, the total lunar eclipse also will be partly visible in western Europe. It will be fully visible in Greenland and Iceland.
When the moon is completely eclipsed, it looks darker and appears to have an orange or even a red color. That is because the reduced amount of sunlight which reaches the moon is scattered by the Earth's atmosphere. A sunset on Earth looks orange for a similar reason.
Because of its reddish color, an eclipsed moon is sometimes called a blood moon.
In North America, there are traditional names given to each of the 12 full moons that happen throughout the year. January's full moon is known as the wolf moon or the great spirit moon. So this weekend's eclipse is being called a super, blood, wolf moon by some people.
在北美，每年的12个满月都有其传统名称。一月的满月被称之为狼月或是great spirit moon。所以这个周末的月食也被一些人称之为超级血狼月。
The eclipse will begin shortly after sunset in eastern North America and South America depending on where you are. A total lunar eclipse can be seen easily with the unaided eye.
Hartigan said, "It's just a wonderful thing for the whole family to see because it's fairly rare to have all these things kind of come together at the same time."
While the moon, Earth's only natural satellite, will be closer than usual, it still will be 357,000 kilometers away from our planet. This will be the first of three full-moon supermoons this year.
The next total lunar eclipse visible anywhere in the world will not happen until May 2021.
I'm Mario Ritter Jr.