The longest lunar eclipse in 580 years takes place tomorrow. It will be the second eclipse of the year.
What is it?
A partial lunar eclipse will take place in the wee hours of the morning Friday. According to Space.com, the magnitude of the eclipse is 0.974, which is why the eclipse is counted as partial rather than total, even though it will still resemble a total lunar eclipse.
A lunar eclipse occurs when the Sun, Earth, and Moon align so that the Moon passes into Earth’s shadow. In a total lunar eclipse, the entire Moon falls within the darkest part of Earth’s shadow, called the umbra. In this eclipse, up to 99.1% of the Moon’s disk will be within Earth’s umbra.
Excited for the upcoming #LunarEclipse?
— The Weather Channel (@weatherchannel) November 16, 2021
Blood Moon/ Beaver Moon
During a lunar eclipse the moon can appear to turn red as the sunlight reaching the moon passes through the earth’s atmosphere, earning itself the name “Blood Moon”. Typically November’s full moon is called the “Beaver Moon”. This nickname originated from Native American tribes who named moon phases based upon natural phenomenon occurring during the season. Allegedly the Beaver Moon is named so because the beavers would build their dams around this time of year to prepare for the coming winter. Other names for November’s full moon include Reed Moon, Mourning Moon, and Frost Moon.
How and when to see it
The best time to go out and see the eclipse will be right around its peak, on November 19th at 3:03 am locally. But the moon will begin to pass into the Earth’s shadow much earlier, around midnight Central Time. NPR reports that at 1:19 a.m., the moon will move into the umbra, the inner part of Earth’s shadow and begin to look like a chunk is missing from it. It will turn red around 2:45 a.m.
Watch the moon’s progression here: