Rabu, 26 Mei 2021

In Photos: Second-Shortest ‘Blood Moon’ Of The Century Dazzles World And Sets Up ‘Ring Of Fire’ Eclipse Of The Sun - Forbes

Did you see the “Blood Moon?” From Hawaii and Australia to the west coast of the U.S. the full Moon was turned a dark reddish color by Earth’s shadow on May 26, 2021 as a total lunar eclipse struck. 

So when is the next lunar eclipse?

Although totality—those precious moments when the full “Flower Moon” was inside Earth’s penumbral (inner) shadow—lasted just 15 minutes, our satellite turned a deliciously photogenic reddish-brownish copper colour. 

Images are now coming in from across the night-side of the world on May 26, 2021, including those taken close to moonrise and moonset as the “Super Flower Blood Moon” stunned onlookers half a world away from each other. 

Here’s a selection of the best photos from this special celestial event—as well as details of how, when and where you can see a “ring of fire” solar eclipse in exactly two weeks ... and then another “Blood Moon” total lunar eclipse later this year. 

A total lunar eclipse is a global event that can be seen by the entire night-side of Earth. On May 26, 2021 the full Moon turned a reddish color during a brief 15-minute totality that was best seen from the Pacific Rim.

Hawaii, Australia and New Zealand were among the best places to view the lunar totality, which was easily observed high in the sky late at night in mostly clear skies.

In North America the “Super Flower Blood Moon” was most easily seen on the west coast of the U.S. which saw totality low in the southwestern sky just before the full Moon set (though sadly cloud affected the view of many in the Los Angeles area).

The east coast of Asia also got to see totality low in the eastern sky just after the full Moon rose at dusk.

Eastern U.S. states and the Midwest glimpsed some of the earlier phases, but since the full Moon was also a big, bright “supermoon” almost the entire country saw something spectacular—or odd-looking as Earth’s shadow was cast across the full Moon.

The “Super Flower Blood Moon” appeared to be about 7% larger than an average full Moon and around 15% brighter.

It was also the closest full Moon to Earth during all of 2021. The Moon orbits the Earth every 27 days in a slightly elliptical path. 

It therefore has a closest point (perigee) and a farthest point (apogee) each month. The Moon’s perigee this month almost coincided with its “full” phase, occurring just nine hours beforehand. Cue a “supermoon!”

Earth always casts two shadows in space opposite the Sun; one fuzzy outer shadow (its penumbra) and one dark inner shadow (its umbra).

It extends to around 870,000 miles/1.4 million km.

When a full Moon enters Earth’s penumbra—as it did last night—the full Moon’s brightness is dramatically reduced and it’s possible to see Earth’s shadow across the Moon—as in the image above. Only when it began to enter Earth’s umbral shadow does it turn a reddish copper colour. 

During this partial lunar eclipse phase onlookers watched as the full Moon began to turn reddish. But why is a “Blood Moon” red? During a total lunar eclipse the only light that is able to reach the moon’s surface has first been filtered by the Earth’s atmosphere, and the molecules within it.

As sunlight filters through those molecules its light is split. Blue light has a relatively short wavelength so hits lots of molecules and scatters. Red light has a longer wavelength so more of it passes through the atmosphere without striking molecules, so scatters less. That’s why red dominates on the light reaching the Moon’s surface during totality.

What happened on May 26, 2021 was the first of two lunar eclipses in 2021, but the only total lunar eclipse. On November 19, 2021, a full Moon close to its apogee—so relatively small in the night sky (a “micromoon?”)—will mostly, but not completely enter Earth’s umbral shadow. 

However, though only 97% of the full Moon on November 19, 2021 will enter Earth’s umbral shadow, it’s still expected to turn a reddish color. 

The term “Blood Moon” is a relatively recent term to describe a total lunar eclipse. Not only does the full Moon turn a reddish color and rarely appear blood-red, but “Blood Moon” was originally used only to describe four totally eclipsed full Moons in a row—something known as a lunar tetrad. 

Thanks to this total lunar eclipse just gone our Moon is now positioned at one of the two eclipse nodes on its orbital path. Which means that in precisely half-an-orbit’s time it will arrive at the next eclipse node and eclipse the Sun!

On June 10, 2021 an annular eclipse of the Sun will be visible from parts of Canada, Greenland and Russia. Much of the northeast U.S. will see a big partial eclipse just after sunrise, with the extra-special sight of a “horned sunrise” on offer to those who get themselves a clear view very low to the eastern horizon. 

Wishing you clear skies and wide eyes.

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2021-05-26 11:30:13Z
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