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Yes, the RELATIVE humidity is the important thing. There is less water in the air at high altitudes, but the air can hold much less water. It's like putting a thimbleful of water in a shot glass, and a bucketful of water in a paddling pool. The first example has far less water, but will fill...

But if you measure it, the apparent size really doesn't (usually) increase. It's not refraction, it's just an optical illusion.

You can also check the size of the sun image to see if it's "correct". Here is a photo showing the small green lens-flare image of the sun familiar to anyone who takes iPhone photos. That was taken on an iPhone 6 which has a field of view (along the long side) of about 63.5 degrees. The...

Do you have the source?

A simple way to show this would be to film the sun, with the surrounding glare, and pass a dense filter in front of the lens to show the size of the actual sun.

It's false memory syndrome. People susceptible to this belief say that the only clouds that existed in the past looked like sheep without legs, floating in a deep blue sky.

Interesting stuff @Trailspotter. I just checked the path of this flight which left an almost perfectly "vertical" contrail on Saturday evening. The ground track passed within about 700 metres of my location. Looking at the wind, it was virtually behind the plane, so shouldn't have...

You don't need much weight to seed a cloud. The seeding material is basically smoke. By the way, that "stopchemicalterrorism" site is run by Michael D. Fleming, who has some rather unusual beliefs, among them that cloud cannot form at all without human activity. He has some self-published...

"Cloud Forms" published by the UK Meteorological Office. I posted scans here: https://www.metabunk.org/cloud-forms-1949-british-air-ministry.t6629/

They just look like ordinary clouds to me. Cirrus clouds often form linear shapes. In fact a lot of photos that chemtrail believers share as "chemtrails" aren't even contrails, just linear cirrus clouds. They seem to have a strange idea that any clouds with lines or waves are somehow...

I think they're trying to tell me something in Chinese. :) Plane in shot is easyJet flight 6837 from Glasgow to Geneva at 37,000ft.

There are still plenty of blue sky days. When the air is dry, you won't see persistent contrails and the sky will be just as blue as in the past. What may well be true is that days where conditions are suitable for cirrus formation will be somewhat cloudier nowadays than they would have been in...

Not the only FR24 weirdness this week, u less somebody forgot to unhitch the tow tractor before takeoff :)

You might want to post the links of them in the comments on the original. The uploader seems quite serious about wanting to take down any reposts.

The copyright holder has filed a claim against Dane's unauthorised upload, so I'm just transcribing Dane's narration here for posterity. Bear in mind this is just a video of contrails which he found on YouTube and copied without permission, before rebranding it with this own intro, logo and...

The person who originally posted he video confirms he didn't give Dane permission to use it.

This picture has started doing the rounds on Facebook as an "engine modified for chemtrail spraying". I think it may have initially been spread as a joke, but some people seem to be sharing it seriously. In reality it is a snow cannon, used to generate artificial snow cover at ski resorts...

But this site shows the flight running on Wednesdays this month. Odd. https://aviability.com/flight-number/flight-3o468-air-arabia-maroc

I just checked Planefinder and it also lists that flight as Bologna to Casablanca. Weird. According to Flightaware it ran BLQ-CMN weekly until December 2, then did one flight to CBG on Feb 10. Edit: and now FR24 says "diverted to CBG". Maintenance flight, using a retired flight number?

Odd that you said the topic is not discussed and then linked to several papers that discuss it, certainly.