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I'm not exactly sure what you are asking but the sun is visible everyday! Just look up. During a Total Solar eclipse however the outer atmosphere of the sun known as the corona is visible. This is the only time that it can been seen (with the naked eye) from earth.
The corona on the Sun is the plasma aura that surrounds the Sun. It extends millions of kilometers into space and has extremely high temperatures.
The sun's corona is ordinarily not visible (from earth) because though the corona itself is extremely bright, the rest of the sun is even brighter. The sun creates so much light that it makes the corona invisible from earth. The corona however can be seen during a solar eclipse. If you are asking this question than hopefully you already know what a solar eclipse is. If you don' know, a solar eclipse occurs when the Moon passes directly between Earth and the sun, blocking sunlight from Earth. The reason you can see the corona is because the moon though it is much smaller than the sun, looks as if it takes up the the whole sun; that is how it looks like from Earth because of the relative distance between the moon, the sun, and Earth. Since the corona is the most faint layer of the sun, when the rest of the sun is no longer visible (as it is not in a solar eclipse) there is no brighter light that outshines the corona which makes the corona the only visible light coming from the moon and in turn making the corona visible. I do hope this explanation has answered your question and the ones you haven't even asked.
When the Sun's disk is covered due to an eclipse, its corona would still be visible. The most striking coronal features during an eclipse are the white streamers from the sun which extends into the interplanetary medium.
Earth is visible all the time to every human being.
I guess you mean only during a total eclipse of the Sun. At that time we can see the chromosphere and the corona. The outermost layer is the corona.
the moon is between the earth and the sun
The solar corona, the thin sort-of-bright atmosphere of the Sun, was only visible during total solar eclipses. That's because the Sun itself was so much BRIGHTER that the corona was completely invisible except during an eclipse. With a special telescope called the coronagraph developed in 1930, it became possible to block the Sun's direct light and view the corona all the time.
The corona of the Sun is not usually visible to the naked eye; even though it is fairly bright, the Sun itself is so MUCH brighter that you cannot see it. Except during a solar eclipse, when the Moon blocks the direct rays of the Sun. But astronomers can see the Sun's corona at any time,by using an instrument called a coronagraph; this device blocks the direct rays and allows astronomers to study the corona. Think of it as an artificial eclipse maker.
One of the amazing coincidences in astronomy is that during a total solar eclipse, the disk of the Moon is often JUST THE RIGHT SIZE to hide the Sun itself, while allowing the corona to be visible. If the Moon were much larger or nearer, we wouldn't be able to see the corona without special instruments, and we might not have invented them as soon as we did. Of course, it's not a perfect system; when the Moon is near apogee (farthest distance from the Earth) the disk of the Moon is not large enough to cover the Sun, and we have "annular" eclipses. And with the proper instrument, called a "coronagraph", you can see the Sun's corona any time you like. There are several available for viewing on the web; spaceweather.com often features coronagraph photos. The Sun's corona is bright only when compared to the blackness of space; when the Sun itself is visible, the corona is invisibly dim by comparison. So when the Moon blocks the disk of the Sun itself, or when we artificially block the Sun, we can finally see the corona.
Sorry; the eclipse ended about 45 minutes ago. It was only visible in Asia, along a path from northern India to central China. It was not visible at all from North America. The next total eclipse visible in North America will be on August 21, 2017, along a track from Portland, OR to Charleston, SC.
Because there's a certain time of night when you like to do all of your stargazing. If you were willing to look for it at any time when it's dark outside, you could see Corona Borealis somewhere in the sky during nearly 10 months of the year.