Recent content by .Scott

The video mentions one answer of "at least 30" based on China boat licensing practice. But, the voiceover claims a few times that there is not enough information. Whether there is enough information depends on what is "enough" precision - and if your going to ask such an off-the-wall question...

There is a table in that article those shows "dusty faint" galaxies at "~700 million" "Years after Big Bang". It's not big news, but it's 400 of them, not just a hand full.

Your homework statement is: "How to determine practically the geographical and magnetic meridians at a place P on the surface of the Earth?". Clearly, using a phone app is the most practical thing in most cases. But I guess "practically" depends on what your situation is. The sundial shown...

Certainly the most common (old-style) way is to locate either Polaris (Northern Hemisphere) or The Southern Cross. A crescent moon provides a far less precise celestial indicator. Draw a line through the crescent moon that cuts the "C" vertically and extend it to the horizon. That point will...

It's a very entertaining show. Unless you hadn't noted the jumps at 0:42 and 0:46 are not just jumps. They are propelled by a device in the platform. There are many cases where a robot here or there will do one or more extra foot taps - apparently to rebalance or reposition. But it also makes...

Hydrazine-1_1_2_2 tetracarbonitrile wikidata Google says: Based on chemical structure, this compound is likely to be a highly reactive, specialized chemical rather than a commodity chemical, and should be handled with extreme caution in a research environment. I was unable to find an MSDS (or...

At a minimum, at A=1.5, I do not see anything in front of me except the black hole. Whether I see anything being pulled toward me is something we should discuss after I lay out some of the math (probably not this week).

I am not avoiding them. In fact, some revelation about exactly how they are working might be the resolution to this. At least to me, those distant observations tell me something about the non-Euclidean environment that I am it - and alerts me to look for a discrepancy in my altimeter. As I...

I will look at the "homework" that @Ibix gave me (which I think is promising.). And I will also look to get a better calculation for the A=2.1 case - although I do not think that will change this discussion in the least. As for the "optical effect". There is not more math to that. It's just...

No. My concern is that when I look out to the other pendulum pairs, what I see it not a simple 90-degree angle between the pendulum and the bottom of the Dyson sphere - that, for example, the actual view is foreshortened along some axis other than the horizontal or vertical. If that is the...

OK. Then what kind of measurement should he do. Does the dH really go to zero? Or will the altimeter really work correctly? At the moment, you seem to be on the "dH is right - the optical measurement method is wrong". That's clearly possible - but I also think it's just a guess. Are you...

(how to measure dH) The reason I do not just "measure the top and bottom" is that I am unsure whether I would be properly considering relativistic effects. For example, if I stretched the ruler across space from one pair to the next, would that ruler follow the curvature that the photons are...

If it is purely an optical effect, then yes. But how do I know that's what it is? It seems to be a feature of the non-Euclidean space. This is really getting to the meat of my question.

In response to: "because of the curved space time geometry, that inside surface would appear flatter that expected". That's just the circular trajectory of the photons in the photon sphere. For example, in a Dyson sphere with a small planet, a point on the interior of the sphere that is 90...

The point I am making only relies on there being someplace (like ##1.5r_S##) where the bobs will be pointing directly down, will reflect the light horizontally, and then those photons move on to the next bob. So, if the Dyson sphere is slightly too low, crank it up a half a meter and repeat the...