Super-sized Lunar Eclipse -Total Eclipse of the Moon

Moon watchers in the western U.S., Hawaii and elsewhere across the globe were treated Saturday to a rare celestial phenomenon: a total lunar eclipse.
For 51 minutes starting at 6:06 a.m. PST, the Earth's shadow completely blocked the moon.
The moon took on a reddish glow, as some indirect sunlight continued to reach it after passing through the Earth's atmosphere. Since the atmosphere scatters blue light, only red light strikes the moon, giving it a crimson hue.

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Super-sized Lunar Eclipse -Total Eclipse of the Moon

This year's second total lunar eclipse on Saturday morning will offer a rare chance to see a strange celestial sight traditionally thought impossible.

Ringside seats for the lunar eclipse can be found in Alaska, Hawaii, northwestern Canada, Australia, New Zealand and central and eastern Asia. Over the contiguous United States and Canada, the eastern zones will see either only the initial penumbral stages before moonset, or nothing at all.

Over the central regions of the United States, the moon will set as it becomes progressively immersed in the Earth's umbral shadow. The Rocky Mountain states and the prairie provinces will see the moon set in total eclipse, while out west the moon will start to emerge from the shadow as it sets.

The moon passes through the southern part of the Earth's shadow, with totality beginning at 6:06 a.m. PT and lasting 51 minutes.

For most places in the United States and Canada, there will be a chance to observe an unusual effect, one that celestial geometry seems to dictate can't happen. The little-used name for this effect is a "selenelion" (or "selenehelion") and occurs when both the sun and the eclipsed moon can be seen at the same time.

And indeed, during a lunar eclipse, the sun and moon are exactly 180 degrees apart in the sky; so in a perfect alignment like this (a "syzygy") such an observation would seem impossible. Seeing the impossible

But wait! How is this possible? When we have a lunar eclipse, the sun, Earth and moon are in a geometrically straight line in space, with the Earth in the middle. So if the sun is above the horizon, the moon must be below the horizon and completely out of sight (or vice versa).

But it is atmospheric refraction that makes a selenelion possible.

Atmospheric refraction causes astronomical objects to appear higher in the sky than they are in reality.

For example: when you see the sun sitting on the horizon, it is not there really. It's actually below the edge of the horizon, but our atmosphere acts like a lens and bends the sun's image just above the horizon, allowing us to see it.

This effect actually lengthens the amount of daylight for several minutes or more each day; we end up seeing the sun for a few minutes in the morning before it has actually risen and for a few extra minutes in the evening after it actually already has set.

The same holds true with the moon as well.

As a consequence of this atmospheric trick, for many localities there will be an unusual chance to observe a senelion firsthand with Saturday morning's shadowy event. There will be a short window of roughly 1 to 6 minutes (depending on your location) when you may be able to simultaneously spot the sun rising in the east-southeast and the eclipsed full moon setting in the west-northwest.

Regions of visibility

For places to the east of the Appalachian Range, this will, unfortunately, be a non-event. Although the moon will still be above the horizon when it begins to enter the Earth's shadow at 6:33 a.m. EST, it initially is the penumbral shadow that first contacts the moon.

This shadow is so faint that at least three-quarters of the moon's diameter must be immersed within it before you would have a chance of detecting it visually, either with your naked eyes or using an optical aid. That means, if you live in places such as Boston, New York or Miami, the moon will look perfectly normal as it sets.

Joe Rao / Space.com

This table shows the local times of sunrise and moonset, along with the percentage of the moon's diameter that is within the dark umbral shadow at the time of moonset, for 11 selected cities. An asterisk (*) indicates that totality has already occurred and that the moon is emerging from the umbral shadow. Note that locations farther to the west have the moon and sun together in the sky for a noticeably longer interval. That's because after mid-eclipse, the moon's orbital motion has carried it a bit more to the east and thus higher up in the sky, so it remains in view a bit longer.

But from southeast Ontario, through the Ohio Valley and continuing south to the central Gulf Coast, the upper-left portion of the moon will begin appearing somewhat darker or "smudged" as it begins to disappear beyond the horizon. As you head farther west, the moon's entry into the much-darker part of the Earth's shadow (the umbra) will become evident at 7:45 a.m. Eastern Time or 6:45 a.m. Central.

Across portions of the Upper Midwest, the Nation's Heartland, down into the central parts of Oklahoma and Texas, about half of the setting moon will be immersed in the umbra. The shadow will appear to be creeping almost straight down across the moon's face from its upper limb.

Across the Central and Southern Plains only the lowermost portion of the moon will remain in view as it moves down below the west-southwest horizon. Farther west and north, across the Desert Southwest and High Plains, the moon will rise completely immersed in the Earth's shadow, while for parts of the Intermountain Region, Northern California and the Pacific Northwest, the moon will begin to emerge from the umbra as it sets.

Important facts to consider

In order to observe the selenelion, you should make sure that both your east-southeast and west-northwest horizons are free of any tall obstructions that might block your views of the setting moon or rising sun.

Also, keep in mind that, depending on the clarity of your sky, you might actually lose sight of the moon about 10 or 15 minutes before sunrise thanks to the brightening morning twilight and the moon sinking into any horizon haze (atmospheric "schmutz").

Keep in mind that this holds only for the uneclipsed portion of the moon. Indeed, if the moon is totally eclipsed at moonset, you will probably have to scan the western horizon as the twilight increases in order to detect the moon, which will perhaps resemble a dim and eerily illuminated softball.

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If you take a photo or video of the eclipse that you'd like to share with Space.com for a possible story or gallery, please email Tariq Malik at tmalik@space.com or Clara Moskowitz at cmoskowitz@space.com.

Joe Rao serves as an instructor and guest lecturer at New York's Hayden Planetarium. He writes about astronomy forThe New York Timesand other publications, and he is also an on-camera meteorologist for News 12 Westchester, N.Y.

Super-sized Lunar Eclipse

Total Eclipse of the Moon

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Dec. 2, 2011: Waking up before sunrise can be tough to do, especially on a weekend. On Saturday, Dec. 10th, you might be glad you did. A total eclipse of the Moon will be visible in the early morning skies of western Northern America.

The action begins around 4:45 am Pacific Standard Time when the red shadow of Earth first falls across the lunar disk. By 6:05 am Pacific Time, the Moon will be fully engulfed in red light. This event—the last total lunar eclipse until 2014—is visible from the Pacific side of North America, across the entire Pacific Ocean to Asia and Eastern Europe: global visibility map.

This photo, taken by Jens Hackman of Weikersheim, Germany, during a total lunar eclipse in March 2007, shows the turquoise outskirts and red core of Earth's shadow sweeping across the face of the Moon. [video] [full-sized image]

For people in the western United States the eclipse is deepest just before local dawn. Face west to see the red Moon sinking into the horizon as the sun rises behind your back. It’s a rare way to begin the day.

Not only will the Moon be beautifully red, it will also be inflated by the Moon illusion. For reasons not fully understood by astronomers or psychologists, low-hanging Moons look unnaturally large when they beam through trees, buildings and other foreground objects. In fact, a low Moon is no wider than any other Moon (cameras prove it) but the human brain insists otherwise. To observers in the western USA, therefore, the eclipse will appear super-sized.

It might seem puzzling that the Moon turns red when it enters the shadow of the Earth—aren’t shadows supposed to be dark? In this case, the delicate layer of dusty air surrounding our planet reddens and redirects the light of the sun, filling the dark behind Earth with a sunset-red glow. The exact hue (anything from bright orange to blood red is possible) depends on the unpredictable state of the atmosphere at the time of the eclipse. As Jack Horkheimer (1938-2010) of the Miami Space Transit Planetarium loved to say, "Only the shadow knows."

Atmospheric scientist Richard Keen of the University of Colorado might know, too. For years he has studied lunar eclipses as a means of monitoring conditions in Earth's upper atmosphere, and he has become skilled at forecasting these events.

"I expect this eclipse to be bright orange, or even copper-colored, with a possible hint of turquoise at the edge," he predicts.

Earth's stratosphere is the key: "During a lunar eclipse, most of the light illuminating the moon passes through the stratosphere where it is reddened by scattering," he explains. "If the stratosphere is loaded with dust from volcanic eruptions, the eclipse will be dark; a clear stratosphere, on the other hand, produces a brighter eclipse. At the moment, the stratosphere is mostly clear with little input from recent volcanoes."

Clicking on this image takes you to an interactive visibility map courtesy of Larry Koehn, ShadowandSubstance.com.

That explains the brightness of the eclipse, but what about the "hint of turquoise"?

"Light passing through the upper stratosphere penetrates the ozone layer, which absorbs red light and actually makes the passing light ray bluer. This can be seen as a soft blue fringe around the red core of Earth's shadow."

Look for the turquoise near the beginning of the eclipse when the edge of Earth's shadow is sweeping across the lunar terrain, he advises.

A bright red, soft turquoise, super-sized lunar eclipse: It’s coming on Saturday, Dec. 10^th. Wake up and enjoy the show. source:

What causes the earth to experience different seasons?

Have you ever wondered why the earth experiences Fall, Winter, Spring, and Summer? Generally, the Northern Hemisphere will experience different climate conditions than the Southern Hemisphere. For instance, one hemisphere will experience the cold conditions of winter while the other hemisphere experiences the warmer conditions of summer. This is illustrated in the picture at left which shows the Northern Hemisphere countries of the U.S., Canada, and Mexico experiencing the warm conditions of summer while the Southern Hemisphere experiences the cooler conditions of winter. The image on the right shows the reverse: the Northern Hemisphere is experiencing Winter while the Southern Hemisphere experiences Summer.

Did you know that our four seasons exist because of the tilt of the earth on its axis and because of the earth's orbit around the sun? The manner in which this factor produces our seasons is very easy to explain. Take a few moments to think about how this may occur.