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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation
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Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


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  #31  
Old 07-26-2011
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Originally Posted by casey1999 View Post
I have never seen the green flash on a sun rise...........
I'm not surprised. It's very difficult to be looking at the horizon for the sunrise at the moment of rise and at the exact position. Take care and joy, Aythya crew
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  #32  
Old 07-30-2011
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Originally Posted by CaptainForce View Post
People are less likely to see the green flash if:
1) they spend time looking at the sun before the last remnant remains.
2) the horizon is disturbed with larger waves.
3) they expect a moment of brighter light. (it's quick, not intense)
4) the air is humid or hazy or clouds are present.

The spectrum is produced at the limb of the earth in the same manner that white light is refracted in a simple cardboard slit spectroscope. There is no special inversion or reflection of the spectrum and it can be seen on land with the requisite flat horizon such as salt flats or a flat plain. If you consider the visible light as red-orange-yellow-green-blue-indigo-violet; the middle segment (yellow-green-blue) can be briefly distinguished as the "green flash". Of course, we all easily see the early diffused red & orange, so nobody exclaims this "flash" and thoretically one could see the indigo-violet flash, but this requires an even greater sensitivity. The green flash phenomenon is clear and simple optical physics and no mystery. Take care and joy, Aythya crew
If refraction is the answer, why are sunsets red? Think about it again.
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  #33  
Old 07-30-2011
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GreenFlash is in a dry yard untill the splash of Dec 2011.
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  #34  
Old 07-30-2011
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Originally Posted by pdqaltair View Post
I'm stunned by the widespread phenomenon of computers on which the Google search feature is be disabled. I wonder if Google knows?
A new forum member reopened a thread begun in 2001. I don't think Google existed back then.
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  #35  
Old 07-30-2011
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Originally Posted by donradclife View Post
If refraction is the answer, why are sunsets red? Think about it again.
This is much the same as asking why is the sky blue. It's not a matter of refraction, but the selective scattering of light waves by the nature of what the white light is passing through. The composition of the atmosphere contains the molecules with chemical bonds that scatter the blue light and this is apparent. The red light seen before and during the first of sunset is affected by the far thicker and different atmosphere across the surface of the earth at that angle of incidence. Refraction does occur and the spectrum is momentarily evident as the last of the light passes the limb of the earth, but this phenomenon is not related to the earlier seen red color or the even still earlier blue color.
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  #36  
Old 07-30-2011
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Wink Green wink

Green flash is a misnomer. It’s more of a green “wink” -- hard to see unless you’re watching closely. Blink at the wrong moment and you’ll miss it. For a really good sense of how it forms look at the sun through binoculars -- BUT NOT UNTIL the sun is 80-90% below the horizon. What you see is a green edge form first at the sides of the sun and then work it’s way across the bottom and then across the top edge. The middle of the sun (what remains of it) will be orange/yellow surrounded by the flickering green edge. As the sun dips below the horizon the green edges collapse on themselves and in the last instant it “winks” all green.

I always thought it was an urban, no maritime myth -- but it’s real and has nothing to do with the rum you may be drinking at the time.
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  #37  
Old 07-31-2011
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I have never had the opportunity to see it. It seems that it is a rare experience. I don't think there is any reason to worry.
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  #38  
Old 08-03-2011
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Quote:
Originally Posted by billyruffn View Post
Green flash is a misnomer. It’s more of a green “wink” -- hard to see unless you’re watching closely. Blink at the wrong moment and you’ll miss it. For a really good sense of how it forms look at the sun through binoculars -- BUT NOT UNTIL the sun is 80-90% below the horizon. What you see is a green edge form first at the sides of the sun and then work it’s way across the bottom and then across the top edge. The middle of the sun (what remains of it) will be orange/yellow surrounded by the flickering green edge. As the sun dips below the horizon the green edges collapse on themselves and in the last instant it “winks” all green.

I always thought it was an urban, no maritime myth -- but it’s real and has nothing to do with the rum you may be drinking at the time.
Absolutely true.

You can only see it in certain locations, in my experience, in the tropics and only when the sun sets over a very long fetch of water (a sea or an ocean)

I also think it is not believed untill seen, then you want to see another one!
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  #39  
Old 08-04-2011
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Quote:
Originally Posted by Boatinglifeaway View Post
I have never had the opportunity to see it. It seems that it is a rare experience.
Apparently not

Quote:
Originally Posted by casey1999 View Post
I have never seen the green flash on a sun rise but have seen hundreds on a sunset
I have sailed across oceans for three decades and I've seen it once. I feel positively deprived.
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Old 08-09-2011
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Unhappy Link no good

This link to "green flash" is no longer valid.

http://www.geocities.com/buccaneersa...reperfect.html
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