Once in a blue moon

Once in a blue moon

Once in a blue moon

This confluence of events has not happened since the second half of the 19th century.

How unusual are Blue Moon eclipses?

After this year, the next time that a Blue Moon passes through Earth's umbra will be on December 31, 2028, and, after that, on January 31, 2037. Now, sky watchers are preparing for an even rarer event this month: a blue moon total lunar eclipse. That stunning event will lead to the moon turning a deep, rich red, a sight that has led to it being christened the "blood moon". Both will be total eclipses. However, you might be lucky enough to watch a part of it in Hawaii and Alaska. But even NASA is calling the event a supermoon, so we'll go with it! The New Year marked the day for two of the three supermoons one after the other which has been dubbed by NASA as the "Supermoon trilogy".

It's almost impossible to compare the apparent size of the supermoon with a micromoon from memory, but when seen side-by-side as in this graphic, it becomes clear.

The Moon is what's called tidally locked, which means the same side always faces Earth. A royal blue blood supermoon will crown this spectacular season on January 31. Another trio comes in 2019.

As long as there is not too much cloud, the moon should be clearly viewable in the sky. The second one is marked by a blue moon.

Once in a blue moon? . As described by NASA, super moon light up the dark night sky as it approaches close to the Earth.

Supermoons, meteor shower to light up the sky this January

Typically, only one full moon occurs in a calendar month. This usually happens about every 2.7 years, though because February has only 28 days, a number of regions will get another blue moon in March 2018.

"Often cast in a reddish hue because of the way the atmosphere bends the light, totally eclipsed Moons are sometimes called 'blood moons'".

This happens at least twice a year - but in this case, it's the fact that all these events coincide that makes it so cool.

For the Indian subcontinent, the Middle East and Eastern Europe, the Blue Moon total eclipse will already be underway as the Moon rises.

Here is everything you need to know. The partial eclipse begins 11:48 Universal Time (UT), and the total eclipse begins at 12:52 UT and reaches it's maximum at 13:30 UT.

Along the U.S. West Coast, the total phase begins at 4:51 a.m. PST.

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