"A blood moon is a term used to describe a total lunar eclipse, which is when the moon appears darkened as it passes through the Earth's shadow. The total lunar eclipse is given the "blood" nickname because of the "beautiful" red color caused by the projection of all of the Earth's sunrises and sunsets onto its surface, Petro said. The next lunar eclipse visible in the U.S. will be on Jan. 21, 2019, according to NASA. It won't be a blue moon, but it will be a super moon. A super moon is a full moon or new moon that coincides with the moon's position at its closest to the Earth.
A blue moon is merely a "quirk in the calendar," as the second full moon in a month, Petro said, adding that there is "nothing really to see there."
In the early morning hours of Jan. 31, the moon will transform to a reddish hue as becomes completely submerged in the Earth's shadow, Petro said.
Who can see the super blue blood moon?
All those on the West Coast will have to do is get up extremely early -- before 4 a.m.-- and look up to the western sky. They will see the moon, which will dim as it passes into the Earth's shadow, Petro said.
In San Francisco, for example, the partial eclipse will begin at 3:48 a.m. and go into total eclipse from 4:51 a.m. to 6:07 a.m., according to NASA.
The farther east you go, the less you'll be able to see."