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DON’T MISS: AN ALMOST TOTAL LUNAR ECLIPSE

By Molly Wasser and Ernie Wright, NASA on Nov 13, 2021Nov 13, 2021


On November 19, 2021 (late evening of the 18th in some time zones), the Moon
passes into the shadow of the Earth, creating a partial lunar eclipse so deep
that it can reasonably be called almost total. Credit: NASA’s Scientific
Visualization Studio




WHAT IS AN “ALMOST TOTAL” LUNAR ECLIPSE?

A lunar eclipse occurs when the Sun, Earth, and Moon align so that the Moon
passes into Earth’s shadow. In a total lunar eclipse, the entire Moon falls
within the darkest part of Earth’s shadow, called the umbra. In this eclipse, up
to 99.1% of the Moon’s disk will be within Earth’s umbra.


HOW CAN I OBSERVE THE ECLIPSE?

The best viewing will be right around the peak of the eclipse, on November 19th
at 9:03 UTC/4:03 AM EDT/1:03 AM PDT. This part of the eclipse is visible in all
of North America, as well as large parts of South America, Polynesia, eastern
Australia, and northeastern Asia.



A world map showing where the eclipse is visible at the time of greatest
eclipse. Earlier parts of the eclipse are visible farther east, while later
times are visible farther west. Credit: NASA’s Scientific Visualization Studio




WHAT CAN I EXPECT TO OBSERVE?

All times are in UTC on November 19, 2021.

6:02 Penumbral eclipse begins The Moon enters the Earth’s penumbra, the outer
part of the shadow. The Moon begins to dim, but the effect is quite subtle. 7:19
Partial eclipse begins The Moon begins to enter Earth’s umbra and the partial
eclipse begins. To the naked eye, as the Moon moves into the umbra, it looks
like a bite is being taken out of the lunar disk. The part of the Moon inside
the umbra will appear very dark. 8:45 Red color becomes visible More than 95% of
the Moon’s disk is in the umbra and the Moon will appear red. The color might be
easier to see in binoculars or a telescope. Using a camera on a tripod with
exposures of several seconds will bring out the color, at the expense of
overexposing the lit part of the Moon. 9:03 Eclipse peak The peak of the eclipse
occurs at 9:03 UTC. This is the best time to see the red color. 9:20 Red color
no longer visible The redness fades as less than 95% of the Moon is in the
Earth’s umbra. It appears that a bite is taken out of the opposite side of the
Moon from earlier. 10:47 Partial eclipse ends The whole Moon is in Earth’s
penumbra, but again, the dimming is subtle. 12:04 Penumbral eclipse ends The
eclipse is over.


WHAT ELSE CAN I SEE TONIGHT?

During the eclipse, the Moon moves through the western part of the constellation
Taurus. The Pleiades star cluster is to the upper right, and the Hyades cluster
― including the bright star Aldebaran, eye of the bull ― is in the lower left.
Here are some more skywatching tips for the month of November.






WHY DOES THE MOON TURN RED DURING A LUNAR ECLIPSE?

The same phenomenon that makes our sky blue and our sunsets red causes the Moon
to turn red during a lunar eclipse. It’s called Rayleigh scattering. Light
travels in waves, and different colors of light have different physical
properties. Blue light has a shorter wavelength and is scattered more easily by
particles in Earth’s atmosphere than red light, which has a longer wavelength.
Red light, on the other hand, travels more directly through the atmosphere. When
the Sun is overhead, we see blue light throughout the sky. But when the Sun is
setting, sunlight must pass through more atmosphere and travel farther before
reaching our eyes. The blue light from the Sun scatters away, and
longer-wavelength red, orange, and yellow light passes through.



The landscape of the Moon, foreground, is reddened by sunlight filtered through
Earth’s atmosphere. The Sun is obscured by the Earth, but the glow of its corona
is visible. Credit: NASA’s Scientific Visualization Studio



During a lunar eclipse, the Moon turns red because the only sunlight reaching
the Moon passes through Earth’s atmosphere. The more dust or clouds in Earth’s
atmosphere during the eclipse, the redder the Moon will appear. It’s as if all
the world’s sunrises and sunsets are projected onto the Moon.


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Comments ( 13 )
Add Comment
 * John L Granacki 2 days
   
   UTC = No one knows what the hell you’re talking about without Googling it.
   
   
   * Albert 2 days
     
     Wow.
     
     
 * 11 1 day
   
   Let me guess. GED?
   
   
 * David W Jones 1 day
   
   What a wonderful time to be alive. Just Google it!
   
   
 * Steve Johnson 1 day
   
   We aren’t in daylight time in November
   
   
 * Steve Johnson 1 day
   
   Your times are wrong. Should be standard time.
   
   
 * Michael 24 hours
   
   It also listed PDT and EDT. You want them to list every time zones?
   
   
 * Amanda Blaine 23 hours
   
   Just curious what times should we see it down here in texas??
   
   
 * John Taylor 21 hours
   
   Headline should have indicated this applied to USA only if not visible from
   UK the information is of limited use.
   
   
 * Seth 17 hours
   
   An almost total eclipse that will be clearly visible to almost nobody awake
   at that time.
   
   
 * Connie 16 hours
   
   November 19 is standard time! I’m in central standard time. When will I see
   it????? If you give me any standard time I can figure out when I can see it.
   I’m too old to try to figure it out of a daylight time.
   
   
 * Jay 13 hours
   
   Great article. Correction for the penultimate sentence: clouds have big
   (water) particles and scatter all wavelengths nearly equally, hence they are
   white — this is Mie scattering. The light reaching the moon during the
   eclipse will pass thru the clear atmosphere (small particles, ie molecules)
   and the blue end of the spectrum will scatter out leaving the red end to
   illuminate the moon — Rayleigh scattering does this. More dust and clouds
   would make the moon more white but way up in the atmosphere there is not so
   much dust and clouds so largely it’s red light that passes thru earth’s
   atmosphere to the moon and the blue light is Rayleigh scattered out.
   
   
 * Nikvau 9 hours
   
   Thank u for ur info since everyone else is so negative. This is whats wrong
   with out country. Just sad so thank you and I will be figuring out my time
   here in Delaware and even if I dont see I can say I was there
   
   

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