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This is re: the "water level on a plane" question that was discussed earlier. Video description: Liquid (ice tea) stays level with respect to the cockpit's interior as pilot Bob Hoover executes a barrel roll, turning the horizon through 360°. Source: https://youtu.be/V9pvG_ZSnCc Well, you have...

It limits the initial beam angle to a provable 2*arctan((diameter of laser aperture+diameter of cap hole)/2 /length of pipe), and makes an appeal to intuition that the beam is straight. Assuming that the copper pipe shows no internal reflection, which is, well, debatable, unless the laser can be...

A water level is only accurate if the density of the liquid is the same throughout. That makes Laser's "red and clear" and your image poor evidence, because the composition of the liquid in each end is visibly different. With any level, the thing to do is to take two pictures, one with the...

The observation takes place (starts) an hour before sunset with the sun low in the sky, and the air starting to cool. If the weather was overcast and windy, I would expect the refraction to be slight, and the lights only to be visible from a height; if the day was sunny and the evening is calm...

I just saw that John D no longer labels the Brighton event as an experiment. That means he refuses to state a hypothesis such as "if you observe Worthing Pier from the old Brighton Pier at an altitude of 1m above low tide, a light at the altitude of 1m can be seen." I guess this means that...

Thank you! Your humidity gradient image does show a noticeable change near the waterline where the laser/light would be located. That is also where any temperature gradient resulting from air/water temperature difference would be strongest. Both probably depend on wind speed. I haven't yet...

View of Maledives airport (VRMM) from the North, the vanishing point is exactly on the wing edge. The seawall visible on the left is not distorted, it is curved in reality.

They're appealing, but don't rise to scientific standards. There is no proof that the sides of the pool are parallel. We don't know the airport, if we did, we could get the data for the elevation of either end of the runway to determine the slope of the runway [see below], and regulations (plus...

A fourth/fifth method is daytime observation of a laser or powerful light, as planned for the 2019 pier2pier observation. A sixth method is observing the light produced by reflecting the sun with a mirror. There is regularly a big difference between refraction during the day (low/negative k)...

I don't see how it assumes that, if the gradient varies with height, then k varies as well, with the layer? Do you determine refraction from the densities of the layers directly? The study below used single-sided and reciprocal zenith angles to measure k in Greece, correlating the measurements...

How good is your simulation at low heights above water? Humidity is probably a strong factor. I don't see the relationship from Wikipedia:Atmospheric refraction anywhere, is that part of the computations in some other way? (original source: "Monitoring of the refraction coefficient in the lower...

I have the exact opposite impression: the bigger angels are brighter and seem closer. How can you tell?

Ok, I am not sure I understood your question correctly the first time. Are you asking if we can tell from a video whether the device has been adjusted correctly? There are criteria for getting the steps right: * find the neutral position of the torsion scale (let it swing with the rod fixed...

Well, it's good if it works without any undue jerks. Probably needs a youtube tutorial. ;-P @deirdre The second part was written almost two years later. First Bucka outlines a method to enhance the effect. In the original, that axis is oriented N/S to eliminate the gyrocompass effect, but here...

The The "ROMER LED Rechargeable Handheld Searchlight/Torch" is a 6000 lumen flashlight. The lasers have 10mW and 30mW, respectively. In light of the sun's position, I'd simply use mirrors, Brighton requires one, Worthing requires two since the sun is in their back. But I guess they also want to...

I just read through the German paper, and in the light of the preceding discussion, here's what I found: The Frame needs to be light, ideally just wires, and the spacer. Fishing line might be too elastic? There's an adjust built into the spacer to tighten one of the vertical so that the axis...

Dr John D is repeating the Worthing-Brighton oberservation on Sat Feb 2nd 2019 3:30 pm as a group event; various people have been invited, and the interested public is welcome. More details and a moderated temporary forum can be found at the project website, http://www.pier2pierexp.com/ My...

Hi! I've been looking into Flat Earth for a few weeks now, come across metabunk on Google searches, and then @Rory planted the notion in my mind to look more closely. The section on how to debink and psychology is interesting, and probably needs more work? because I'm still fairly clueless as...