PianoRacer » November 21st, 2017, 5:42 pm wrote:I found this video, which attempts (and fails) to triangulate the position of the sun, interesting as well:
full link: http://www.youtube.com/watch?v=Te9nu6MgpCA
Anyway, I'd be interested in your thoughts, especially on the Sun position video and if there are any glaring problems with it (I couldn't find any, but I'm no "rocket scientist").
NotRappaport » 19 Nov 2017, 01:33 wrote:agraposo » November 18th, 2017, 6:40 am wrote:I'm wondering how some basic trigonometric calculations can demonstrate in any way that some light point crossing the sky is situated 400 km away or wherever. The object paths seen in the charts are independent of the distance of the object.
No, they are not independent of the object's altitude. All you have to do is check the path given for locations that are at various distances in a line perpendicular to the path.
NotRappaport » 19 Nov 2017, 01:33 wrote:To illustrate this, lets use a pass not too far from Simon's part of Italy that will take place on 01-Dec.
NotRappaport » 19 Nov 2017, 01:33 wrote:If it were 30 km overhead, it's maximum altitude as viewed from each of these locations would be:
A: atan(30/5) = 80.5°
B: atan(30/10) = 71.6°
C: atan(30/15) = 63.4°
D: atan(30/20) = 56.3°
E: atan(30/25) = 50.2°
F: atan(30/30) = 45.0°
If it were 400 km overhead, it's maximum altitude as viewed from each of these locations would be:
A: atan(400/5) = 89.3°
B: atan(400/10) = 88.5°
C: atan(400/15) = 87.9°
D: atan(400/20) = 87.1°
E: atan(400/25) = 86.4°
F: atan(400/30) = 85.7°
agraposo wrote:Can we ask Simon to do the experiment? He and a friend 30 km away from his house could measure the object's altitude at the same time and see if it is close to 45º or 85º
The_White_Lodge » November 24th, 2017, 7:48 pm wrote:I eagerly await the findings of Nonrappaport come Monday.
agraposo » November 25th, 2017, 5:09 am wrote:The object's distance can be calculated comparing P(A) and P(B) at the same time. Have you done this calculation, as a practical example, without resorting to Heavens Above charts?
NotRappaport wrote:If I look up the chart for 3 or 4 different locations a few km apart, how would Heavens Above and Stellarium and Calsky all "know" from which location I would really make observations and hence which one they should show me accurate path data? And indeed for evening passes I have an alternate viewing location that is about 10km South-West of my main location. How would they know I won't observe from there?
hoi.polloi » November 25th, 2017, 10:08 pm wrote:NotRappaport wrote:If I look up the chart for 3 or 4 different locations a few km apart, how would Heavens Above and Stellarium and Calsky all "know" from which location I would really make observations and hence which one they should show me accurate path data? And indeed for evening passes I have an alternate viewing location that is about 10km South-West of my main location. How would they know I won't observe from there?
I think it's been suggested in the past that "the" ISS is an illusion maintained by multiple aerial objects in a global military formation
hoi.polloi » November 25th, 2017, 10:08 pm wrote:It might be more likely they have claimed a near earth object or actually put something on a consistent series of paths, or path.
hoi.polloi » November 25th, 2017, 10:08 pm wrote:Or they are merely projecting something, which would also be a useful exercise of power.
hoi.polloi » November 25th, 2017, 10:08 pm wrote:Have we considered coordinating a couple people, and taking a drive or two to more remote and more likely-to-be-clear viewing locations?
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