what is the inner meaning of watch their last setting sun .
Answers
Answer:
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Explanation:
would argue the exact opposite, in fact: the beauty of a sunset, in all of its varieties and variations, is only enhanced the more you know about it.
Image credit: Dan Schroeder, via Picasa. Image credit: Dan Schroeder, via Picasa.
The next time you watch the Sun descend through the sky, towards the horizon, you might marvel at how the Sun remains the same size all the way down. At just slightly over half-a-degree, the Sun appears to drop at a constant rate throughout the afternoon and into early evening.
But there are some small changes that are extremely important if you want to understand the beauty behind the sunset.
Image credit: Tamas Ladanyi (TWAN), over Lake Balaton, Hungary. Image credit: Tamas Ladanyi (TWAN), over Lake Balaton, Hungary.
The first and most obvious is the change in coloration of the Sun, as well as a severe drop in the Sun's brightness. On an airless world like the Moon, the Sun at sunset would look no different than at any other time. But it's the Earth's atmosphere that makes sunsets so special.
Image credit: Bob King of http://astrobob.areavoices.com/. Image credit: Bob King of http://astrobob.areavoices.com/.
When the Sun appears progressively lower and lower on the horizon, its light needs to pass through more and more of the atmosphere to reach our eyes. You might not think of the atmosphere as being a very good prism, but when you pass through around 1000 miles of it just before the Sun dips below the horizon, it starts to add up.
Image credit: Pete Lawrence (Digital-Astronomy). Image credit: Pete Lawrence (Digital-Astronomy).
The bluer wavelengths of light get scattered away, leaving only the reddest wavelengths that reach your eye. As the sun drops towards the horizon, it progressively loses violets and blues, then greens and yellows, and finally even the oranges, leaving only the reds behind.
You may not even realize it, but by time you'd see a sunset like the picture above, the Sun has already technically set, it's only due to the fact that the atmosphere bends light that we're still seeing it like this.
This is why, if you time a sunset, it will take longer than the expected 120 seconds to go from the moment it touches the horizon to the moment it dips below, even during the equinox at the equator, where it rises and sets as close to completely vertical to the horizon as possible. The Sun appears to linger due to the refraction of our atmosphere.
Also, despite its red appearance, there really still is blue and green light coming from the Sun, of course, while this is going on. But these shorter (i.e., bluer) wavelengths refract slightly more than the lower frequency ones, meaning that the reds come in at a different, shallower angle than the greens and blues, that come in at a slightly steeper angle.
Given a clear path to the horizon -- such as over the ocean -- this means that there's a slight region of space just above the reddened Sun where only the shorter wavelength light is visible!
And when that happens, in addition to the normal color gradient that comes with a sunset, you can also get a small, separate region above the disk of the Sun that appears yellow, green, or even blue!
. As always, click to enlarge.
This optical phenomena is always most clearly visible over a flat area in pollution-free skies, and is known as the green flash. It occurs in many different stages, sometimes appearing at the limb of the Sun or just above it, but most it commonly appears just after the disk of the Sun has set, in a literal "flash" lasting just a few seconds, just barely above the horizon.
Although there's a lot of green light in the Sun, the bluest wavelengths refract even more than the green ones do. In principle, you could get a "flash" of any wavelength -- yellow, green, blue, or even violet -- if the atmosphere cooperated. Although green and yellow flashes are the most common, under just the right atmospheric conditions, you can see even blue colors flashing at a high angle above the top of the Sun!
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This applies to any very bright, white-light object that encounters our atmosphere as seen just barely above the horizon. So that means the Moon, which reflects sunlight back at us, should also exhibit a green flash under the right atmospheric conditions. And although I've never seen it with my own eyes, some diligent astrophotographers have captured the sight to share with us all.