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I still think the discussion with him could have been handled in a better way. https://www.metabunk.org/posts/30761

Regarding planes at travelling altitude, I think a magnification of 30x may still be insufficient; I remember having tried and thrown away the results once. Annother issue: when I tried to catch a trailing plane going overhead with my spotting-scope-attached Nex 3, I was not able to get a...

You are right, the digiscoping approach is not suitable for quick action. I'm using superzoom cameras for that; I started with a Casio FX20 (26x) and have since moved to a Fuji HS30 (30x). Both have a shake-correcting feature which is required if you're holding the camera in your hand at maximum...

I am doing similar things with my spotting scope and various digital cameras, more in a bird-watch-related way. There are all kinds of relatively expensive ways of attaching the camera, but there are also simple holding devices like this one...

If you have read the article, go to Google Images and search for "aerodynamic contrail". Some extremely cool pictures will show up. https://www.google.com/search?q=aerodynamic+contrail&tbm=isch

The beautiful skyline of San Francisco has not deserved this ...

I am not convinced this conclusion is correct. At some points in the discussion with John, I sensed that his conviction was shaken. The point I want to make is that people who are about to question fundamental things about themselves and their beliefs tend to be more sensitive in their...

Iain, annother thing to take into account is wind drift. Once a persistant and wide-spread trail is overhead of you, it is "old" and may already have moved side-ward quite a bit. The plane that created the trail may well have gone by somewhere distinctly not overhead.

Iain, regarding the ADS-B equipment: there is quite a number of aircraft types that are usually not equipped with an ADS-B transponder. See a list here: http://www.flightradar24.com/how-it-works

John Massaria said: "They have the means, the motive, the practice, the research and ability to spray..." Even if all these statements were proven facts (I think you are heavily overestimating the capabilities of governments), there is still no evidence - not even a hint - that any...

I assume the article in the "Adler" magazine is based on the paper by Ernst Schmidt. Here is my shot at translating the interesting part in that paper (pg. 19 and 20). For references to "DFS", see Wikipedia The problem of sublimation and condensation in supersaturated layers low on nuclei...

Well, why shouldn't the smoke particles be able to act as condensation nuclei? BTW, all the videos seem to have gone. I suspect the creators will try to sell them (not that they could be blamed) ...

The trail (most likely smoke) stayed visible for several minutes, so there should be a plethora of images available shortly for the "not-a-contrail" corner. Here is one from chelyabinsk.ru, by Yekaterina Pustynnikova:

There are now reports of injuries. A school and some other houses have been hit, according to Russian officials (via DPA). Edit: A factory building was also damaged. Annother edit: The damages were likely caused by the pressure shock of the main body explosion.

Amazing how many people have cameras running nowadays ... Thanks to that fact, there are several excellent videos showing the entry and obvious breakup of a fairly big meteor (not "meteorite", please excuse the headline ...). Rumors are already flying, like UFO panic and bogus reports of a...

Accidentally, I was thinking about the possible effects of global warming on contrail formation while replying to a blog post at Contrailscience. Even if there is no increase in RH, the absolute amount of water vapor in the air (from ground up) is rising. These 500 ft were added with respect to...

Does that mean you will accept his assessment that the components of the atmospheric sciences are not complex and well understood? Will you repeat to him that "contrail formation is a rather obscure area of study"?

Hint: you might want to google "ross marsden new zealand"

The Iraq WMD affair is actually an interesting example. I agree it was a conspiracy of the top government - and a rather bungled one. Few people outside the U.S. were convinced by the "evidence", and critical voices inside were hesitant to call the bluff loudly enough, fearing being labelled...

That may be true, but mind that - on the other hand - the general "conspiracy theorist crowd" seems ready to believe the wildest claims on YouTube and Facebook. Why not apply the same caution there? Example: in videos and image captions, you will often find the claim that 'normal' contrails...