lunar eclipse lunar eclipse june 2011 - 2011 Lunar eclipses

 

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A lunar eclipse occurs when the moon passes behind the earth so that the earth blocks the sun's rays from striking the moon. This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, there is always a full moon the night of a lunar eclipse. The type and length of an eclipse depend upon the Moon's location relative to its orbital nodes. The most recent total lunar eclipseoccurred on December 21, 2010, at 08:17 UTC.^[1] The next total lunar eclipse on June 15, 2011 will be a central eclipse, visible over Europe and south America after sunset, over Africa and most of Asia, and Australia before sunrise.

Unlike a solar eclipse, which can only be viewed from a certain relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of the Earth. A lunar eclipse lasts for a few hours, whereas a total solar eclipse lasts for only a few minutes at any given place. Some lunar eclipses have been associated with important historical events.

 

 

 

Unless you've been living under a rock, you know there will be a lunar eclipse tonight.

 

Tonight the world gets to experience the longest lunar eclipse in 11 years. However, your ability to actually watch it first-hand depends on where you are in the world and how late you are willing to stay up.

Luckily, due to modern technology and a few helpful people in areas of the world where the eclipse will be clearest, you’ll be able to watch it from the comfort of your own home via the Internet.

 

 

This eclipse will be completely visible over Africa and central Asia, visible whilst rising over South America, western Africa and Europe, and whilst setting over eastern Asia. In western Asia, Australia and the Philippines, the lunar eclipse will be visible just before sunrise. The North Americans will miss out.

This particular lunar eclipse will be special because unlike most lunar eclipses, the center point of Earth's shadow will fall on the moon. This is known as a central total lunar eclipse, and it will have an unusually long duration.

For those who wish to learn more about lunar eclipses, and especially about this lunar eclipse, I've found a series of videos about lunar eclipses that you might enjoy. These videos answer a few questions about what causes lunar eclipses, why the moon turns red during an eclipse and I've even found a very short video that describes an experiment that NASA will be conducting during this eclipse:

 

 

I am surprised that the previous video didn't explain why the moon (usually) turns red during a lunar eclipse. (Particularly since christians adopted the ancient myth that a blood-red moon is an indication of the second coming of Christ, thus leading to panic among those who don't know the real, scientific explanation for this phenomenon.)

 

Basically, the moon's red colour is all about the Earth's atmosphere: if Earth had no atmosphere, the moon would be completely dark during an eclipse. The moon's red or copper hue is caused by scattering, or refraction, of sunlight passing through Earth's atmosphere into the shadow that it casts onto the moon. Shorter wavelengths of light are most scattered by air molecules, air pollution, dust and other small airborne particles. By the time the photons of light have passed through the atmosphere, only the longer wavelengths remain because they are least scattered. These longer wavelengths are red in colour.

This very short video clip gives you a visual idea of what's happening (no sound):

As I mentioned, tonight's lunar eclipse will provide scientists a unique opportunity to examine the moon. While the sun is blocked by the Earth, NASA's Lunar Reconnaissance Orbiter (LRO)'s Diviner instrument will gather temperature readings from the lunar surface. Since different rock sizes cool at different rates, scientists will use these data to infer the size and density of rocks on the moon. 

This animation shows the lunar eclipse viewed along the Earth-Moon line (no sound):

And, last but certainly not least, if you happened to be standing on the side of the moon facing the earth and sun when the lunar eclipse occurs, here's what you might see (no sound): 

 

To watch this Lunar Eclipse (& any other geographical event) online via satellite you need to download Google earth. Click on the logo below to learn more

To watch this Lunar Eclipse (& any other current event) online via the best news streaming channels you must download trueonlinetv. Click on the logo below to learn more.

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