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Indeed it has been a very good day for distrails. I've seen at least five.

This one is definitely a distrail, similar direction, taken from the back garden a few minutes ago.

Some of us have jobs! ;) Just looking at it by eye from the train (which I appreciate is not an accurate guide to altitude) the clouds with the distrails appeared fairly low. The parallax between the photos, as the train travelled westwards, appears to indicate that the dark trail was also...

I don't think the timings work. Also when I see distrails like the one in the foreground and in the distance they are usually planes landing at Heathrow, so fairly low, like 6-8,000ft. I was thinking AF1080, with the Ryanair flight FR9306 (circled, at 37,000ft) being the bright contrail...

It's not so easy to see in the photos but the end closest to the camera was definitely a distrail through the cloud, with deformed "ragged" edges, not a darker trail in front obscuring the view.

Contrast enhanced to show how the dark trail joins up with the distrails at either end.

I was just doing a bit of skywatching out of the train window when a dark trail caught my eye. At first I thought it must be a contrail shadow but there was no obvious source, and the sun angle seemed wrong. Then I noticed that it lined up with what looked to be a distrail in a cloud overhead...

As part of a PM discussion with a member who was sceptical that the image was created from that original, I demonstrated in real time how easy it would be. This recreation took less than half an hour, including taking all the screenshots as I went: Finished result. This took me less than half...

Tyco Brahe used parallax measurements in 1577 to show that a comet was further away than the moon. He also tried and failed to observe parallax with the stars, so concluded that either the Earth was motionless at the centre of the universe, or the stars were a really really long way away. He...

Looks like a very clear case of reflections of ceiling lights. Isn't that a window frame at the left? Any other photos taken from the same place?

All those images are the same, simply stretched in the vertical direction to different degrees (and with faked bits at left and right). There is no other viewpoint. You seem to be confusing the different shape of the holes with a different viewpoint, but it is just a vertical stretch - notice...

Where are you getting the idea that there are two different viewpoints? The position of the trees and the fallstreak holes matches exactly. The video is simply an animation created from a still image, which is a manipulated version of the original still. If there was more than one viewpoint...

The videos are both created from that one photo. I haven't done a rigorous comparison of the two videos side by side, but as far as I can see the later video that you posted is just a crop from the first video. See the comparisons above: there is no different viewpoint or different angle, it is...

Last time I went to Greenwich I checked the co-ordinates using the GPS on my phone. If you stand on the prime meridian line marked on the ground, it reads about 0°00′05″W. The point where you get "all zeroes" of longitude is about 100 metres further east. It's annoying :) (PS: maybe Dubay could...

Yes, also the left-hand hole itself (of which only half appears in the original photo) has been mirrored and copied to create an entire circle.

It's not a different location or angle. It looks like the same photo to me, just cropped and stretched a bit. The video has had a bit added on to the right, by repeating the tree from further left and cloning in some extra sky. If you just stretch the video vertically slightly, it exactly...

This is true: I was reading just the other day that when MH17 crashed, people inspecting the wreckage initially thought more than one aircraft was involved because the plane was carrying helicopter and other aircraft parts as cargo.

The way to answer this would surely to be get hold of baggage allowance rules from, say, the 1970s or 1980s. Maybe old airline adverts would be a place to find them?

I'm not familiar with the alogrithms used to assess Twitter popularity, but do "active" followers (such as this bot, which tweets a lot) count for more than dormant followers? It could be as simple as that - create bots that would pass for human tweeters on the most cursory automated inspection.

I used Yandex Image Search, which I find gives better results than Google or Tineye in many cases. I just took a crop of the relevant area and used "search by image". It was the very first result in "Similar images":