I've never seen anything like this before, at the end of a dissapating
contrail there was what can only be described as a black 'streak',
perfectly straight and very noticeable. The whole effect lasted a
minute at best.

A bit of Googling (unfortunately most of it's conspiracy theory
nonsense) suggests that this is the answer:
http://contrailscience.com/contrails...es-chemtrails/
I think the "edge shadow (volumetric shadow)" is what I saw,
the contrail was lined up with the sun.

However contrails must be crossing the sun all the time and I've
never seen that effect before. I wonder if you only see it if the
sun is at exactly the right altitude and the observer is in exactly
the right position wrt the sun & contrail.

Has anybody else seen this effect, it was definately a what the
hell is *that* moment!
--
Col

Bolton, Lancashire
160m asl

On 28/06/2011 09:39, Col wrote:
I've never seen anything like this before, at the end of a dissapating
contrail there was what can only be described as a black 'streak',
perfectly straight and very noticeable. The whole effect lasted a
minute at best.

A bit of Googling (unfortunately most of it's conspiracy theory
nonsense) suggests that this is the answer:
http://contrailscience.com/contrails...es-chemtrails/
I think the "edge shadow (volumetric shadow)" is what I saw,
the contrail was lined up with the sun.

However contrails must be crossing the sun all the time and I've
never seen that effect before. I wonder if you only see it if the
sun is at exactly the right altitude and the observer is in exactly
the right position wrt the sun& contrail.

Has anybody else seen this effect, it was definately a what the
hell is *that* moment!

You've just seen a secret British Military energy weapon. The
conspiracy lot would have you think !

On Tue, 28 Jun 2011 09:39:54 +0100, Col wrote:

I've never seen anything like this before, at the end of a dissapating
contrail there was what can only be described as a black 'streak',
perfectly straight and very noticeable. The whole effect lasted a minute
at best.

A bit of Googling (unfortunately most of it's conspiracy theory
nonsense) suggests that this is the answer:
http://contrailscience.com/contrails...es-chemtrails/ I think the
"edge shadow (volumetric shadow)" is what I saw, the contrail was lined
up with the sun.

However contrails must be crossing the sun all the time and I've never
seen that effect before. I wonder if you only see it if the sun is at
exactly the right altitude and the observer is in exactly the right
position wrt the sun & contrail.

Has anybody else seen this effect, it was definately a what the hell is
*that* moment!

Here's one I prepared earlier. ;-)

http://farm7.static.flickr.com/6059/...797844f5_b.jpg



--
Graham Davis, Bracknell
Whilst it's true that money can't buy you happiness, at least you can
be miserable in comfort.

"Graham P Davis" wrote in message
...
On Tue, 28 Jun 2011 09:39:54 +0100, Col wrote:

I've never seen anything like this before, at the end of a dissapating
contrail there was what can only be described as a black 'streak',
perfectly straight and very noticeable. The whole effect lasted a minute
at best.

A bit of Googling (unfortunately most of it's conspiracy theory
nonsense) suggests that this is the answer:
http://contrailscience.com/contrails...es-chemtrails/ I think the
"edge shadow (volumetric shadow)" is what I saw, the contrail was lined
up with the sun.

However contrails must be crossing the sun all the time and I've never
seen that effect before. I wonder if you only see it if the sun is at
exactly the right altitude and the observer is in exactly the right
position wrt the sun & contrail.

Has anybody else seen this effect, it was definately a what the hell is
*that* moment!

Here's one I prepared earlier. ;-)

http://farm7.static.flickr.com/6059/...797844f5_b.jpg

That's exactly what I saw. I don't know whether it went right to the
horizon as there is a building blocking the view.
Was that taken this morning?
--
Col

Bolton, Lancashire
160m asl

"Col" wrote in message
...

"Graham P Davis" wrote in message
...
On Tue, 28 Jun 2011 09:39:54 +0100, Col wrote:

I've never seen anything like this before, at the end of a dissapating
contrail there was what can only be described as a black 'streak',
perfectly straight and very noticeable. The whole effect lasted a minute
at best.

A bit of Googling (unfortunately most of it's conspiracy theory
nonsense) suggests that this is the answer:
http://contrailscience.com/contrails...es-chemtrails/ I think the
"edge shadow (volumetric shadow)" is what I saw, the contrail was lined
up with the sun.

However contrails must be crossing the sun all the time and I've never
seen that effect before. I wonder if you only see it if the sun is at
exactly the right altitude and the observer is in exactly the right
position wrt the sun & contrail.

Has anybody else seen this effect, it was definately a what the hell is
*that* moment!

Here's one I prepared earlier. ;-)

http://farm7.static.flickr.com/6059/...797844f5_b.jpg

That's exactly what I saw. I don't know whether it went right to the
horizon as there is a building blocking the view.
Was that taken this morning?
--
Col

Bolton, Lancashire
160m asl

I have always taken that effect to be a shadow sact by the contrail in the
haze which otherwise makes the sky paler than it would otherwise be. Of
course the contrail has to be in the right location and direction, relative
to the sun (ie pointing nearly towards the sun so that the sun's rays are
significantly attenuated as they pass through the contrail) and the
observer, for the effect to be noticeable.

Roger

On Tue, 28 Jun 2011 10:46:37 +0100, Col wrote:

"Graham P Davis" wrote in message
...
On Tue, 28 Jun 2011 09:39:54 +0100, Col wrote:

I've never seen anything like this before, at the end of a dissapating
contrail there was what can only be described as a black 'streak',
perfectly straight and very noticeable. The whole effect lasted a
minute at best.

A bit of Googling (unfortunately most of it's conspiracy theory
nonsense) suggests that this is the answer:
http://contrailscience.com/contrails...es-chemtrails/ I think
the "edge shadow (volumetric shadow)" is what I saw, the contrail was
lined up with the sun.

However contrails must be crossing the sun all the time and I've never
seen that effect before. I wonder if you only see it if the sun is at
exactly the right altitude and the observer is in exactly the right
position wrt the sun & contrail.

Has anybody else seen this effect, it was definately a what the hell
is *that* moment!

Here's one I prepared earlier. ;-)

http://farm7.static.flickr.com/6059/...797844f5_b.jpg

That's exactly what I saw. I don't know whether it went right to the
horizon as there is a building blocking the view. Was that taken this
morning?

It was July last year. I was on my way to the shops for my morning paper
(or on the way back?) and saw this shadow. I almost always have a camera
tucked in my pocket and usually on a point-and-shoot setting but, even
so, the shadow had faded when I was ready. Luckily, it returned in a few
seconds so I was able to get this shot. This was the first time I'd seen
- or rather, noticed - such a phenomenon.

There are so many times when I wished I'd had a camera or better still, a
movie camera, when some unusual cloud appeared. There was the tornado I
saw about 55 years ago; unusual mammatus that I saw at a similar age
which I likened to the cloud being upside-down - cauliflower turrets
pointing downwards and surging towards each other and disappearing
upwards into the cloud; dark, thick cloud with a ragged base that turned
out to have a base of 25,000ft; patches of Ci Spi turning into what
looked for all the world like flattened-out Cu; a cirrus formation that
appeared like the ceiling of a Gothic cathedral with ribs at right-angles
to each other and with thicker patches hanging sown from the
intersections and, around the bases of these, what I can best describe as
pannus forming in moist air cooled by the falling ice crystals.



--
Graham Davis, Bracknell
Whilst it's true that money can't buy you happiness, at least you can
be miserable in comfort.

"Col" wrote in message
...
A bit of Googling (unfortunately most of it's conspiracy theory
nonsense) suggests that this is the answer:
http://contrailscience.com/contrails...es-chemtrails/
I think the "edge shadow (volumetric shadow)" is what I saw,
the contrail was lined up with the sun.

However contrails must be crossing the sun all the time and I've
never seen that effect before. I wonder if you only see it if the
sun is at exactly the right altitude and the observer is in exactly
the right position wrt the sun & contrail.

Yes, read the part of the linked article starting at "[Math Warning]".

"Gavino" wrote in message
...
"Col" wrote in message
...
A bit of Googling (unfortunately most of it's conspiracy theory
nonsense) suggests that this is the answer:
http://contrailscience.com/contrails...es-chemtrails/
I think the "edge shadow (volumetric shadow)" is what I saw,
the contrail was lined up with the sun.

However contrails must be crossing the sun all the time and I've
never seen that effect before. I wonder if you only see it if the
sun is at exactly the right altitude and the observer is in exactly
the right position wrt the sun & contrail.

Yes, read the part of the linked article starting at "[Math Warning]".

It's the part beyond 'Math Warning' that makes my eyes glaze over....
--
Col

Bolton, Lancashire
160m asl

On 28/06/2011 14:06, Col wrote:
wrote in message
...
wrote in message
...
A bit of Googling (unfortunately most of it's conspiracy theory
nonsense) suggests that this is the answer:
http://contrailscience.com/contrails...es-chemtrails/
I think the "edge shadow (volumetric shadow)" is what I saw,
the contrail was lined up with the sun.

However contrails must be crossing the sun all the time and I've
never seen that effect before. I wonder if you only see it if the
sun is at exactly the right altitude and the observer is in exactly
the right position wrt the sun& contrail.

Yes, read the part of the linked article starting at "[Math Warning]".

It's the part beyond 'Math Warning' that makes my eyes glaze over....

LOL those responses are the ones I read Col.

Aliens, energy beam weapons, and all kinds of weird pseudo science.
It's good for a laugh.

Joe Egginton
Wolverhampton
175m asl