Blood Moon Lunar Eclipse Returns to the Sky

This is the second occurrence for the celestial sight this year.

— -- A blood moon appeared over the United States early this morning, the second occurrence for the celestial sight this year.

Cloudy skies made viewing the blood moon difficult for people in some parts of the United States.

The eclipse is the second in a rare series known as the tetrad, in which the moon is completely covered by the Earth's umbral shadow for four eclipses in a row, as opposed to only partial eclipses that fall in the outer penumbra.