LOS ANGELES (Reuters) – Skywatchers across western North America set their alarms to awaken before dawn on Wednesday to see a rare type of lunar eclipse called a “Super Blue Blood Moon,” with hundreds of expected to view the phenomenon from a Los Angeles mountaintop.

As is the case with all total lunar eclipses, the Earth will cast a darkened red-tinted shadow across the face of its natural satellite, hence the term “blood moon,” but two other factors are combining to make Wednesday’s spectacle particularly unusual.

The eclipse will unfold during the rare occasion of a second full moon in a single month, otherwise known as a “blue moon,” and during a point in the moon’s orbit at which it has reached its closest position to Earth, thus making it appear larger and brighter in the sky than normal, as a “super moon.”

The reddish appearance of the lunar surface – the moon’s image does not vanish entirely during the eclipse – is due to rays of sunlight passing through Earth’s atmosphere as the moon falls into our planet’s shadow.

The last time all three conditions occurred for a single lunar eclipse visible from North America was in 1866, according to the meteorological forecaster AccuWeather.

A blue moon rises through clouds in San Diego, California, U.S., January 30, 2018. REUTERS/Mike Blake

In Los Angeles, a crowd ranging from 1,000 to 2,000 people was expected to make a pilgrimage in the dark to the Griffith Observatory on Mount Hollywood, where extra telescopes will be set up for them to see the celestial show, Griffith Observatory officials said.

“Griffith Observatory is all about having an eyeball to the sky, and so it’s one thing to learn about this event in a book, but it’s another to see it for yourself,” observatory director Ed Krupp said in a phone interview.

A blue moon rises over Balboa Park’s California Tower in San Diego, California, U.S., January 30, 2018. REUTERS/Mike Blake

Krupp, in an act he has performed during other eclipses, plans to dress up like a wizard and bang pots and pans outside the observatory while the crowd watches.

His presentation pays whimsical homage to myths about eclipses dating back to ancient Babylon, when people believed they had to frighten away a mysterious creature swallowing the moon, Krupp said.

In western North America, it will be easy to see the eclipse beginning at 3:48 a.m. Pacific Time, according to NASA. But the lunar show will be less noticeable in the Midwest and even more difficult to spot on the East Coast, where the moon is due to set before the eclipse is in full swing, according to NASA.

Reporting by Alex Dobuzinskis; Editing by Michael Perry


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