You have the formula and the graphic which goes along with it, use it.
For a distance of 50 km, from an elevation of 2 meters, you could see nothing under 158 m.
I included various photographs taken right there on the beach of St. Catharines so that you would get an idea what the elevation of the photographer was; I also included the maximum elevation required to see the roof top of the Sky Dome over a 50 km distance: some 20 meters.
You should have other things to worry about (by the way, I never use bendy light in any of my messages, either as an argument, or as a device to try to divert the discussion).
How would the surface of the water stay curved on a spherical earth?
As we have seen, there is no such thing as attractive gravity.
How did the Nasa/MIR missions take place, given the fact that there is no attractive gravitational force?
What type of a scenario do you believe in? BB or space-time continuum hypothesis? How could the elements have formed in either case, given the helium flash paradox?
And yet, you worry about the horizon line...
Let us do away with any horizon line.
At around 7:15 a.m., Tungus natives and Russian settlers in the hills northwest of Lake Baikal observed a column of bluish light, nearly as bright as the Sun, moving across the sky. About 10 minutes later, there was a flash and a loud "knocking" sound similar to artillery fire that went in short bursts spaced increasingly wider apart.
http://www.salem-news.com/articles/june302008/tunguska_day_6-30-08.phpThat is when Tungus natives and others living in the hills northwest of Russia's Lake Baikal reported seeing a column of bluish light, that they described as being almost as bright as the Sun, moving across the sky.
A few minutes later they reported a flash and a sound that many said resembled artillery fire. The accompanying shock wave broke windows thousands of miles away from the impact zone, and knocked countless numbers of people to the ground.
Even if we take a 560 km distance to Tunguska, and a 1 km altitude (although Lake Baikal is located at some 435 meters in elevation), the visual obstacle will measure 15.5 km, no way for anybody located at Lake Baikal to have seen the explosion itself.
Let us ascend to 1,6 km in altitude at Lake Baikal; even then, the visual obstacle will measure 13.66 km.
The authors of the very well documented work on Tunguska mention:
http://www.icr.org/research/index/researchp_sa_r05/The inhabitants of Central Siberia saw the fall and explosion of the meteorite over an area with a radius of 600-1000 km.
Another eyewitness account:
Nizshne-Karelinskoye (465 km). Extremely bright (it was impossible to look at it) luminous body was seen rather high in the north-western sky soon after 8 a.m. It looked like a tube (cylinder) and for 10 minutes moved down to the ground. The sky was clear, but only in the side, where the body was seen, a small dark cloud was present low above the horizon. While coming to the ground, the body dispersed (flattened) and at this place a large puff of black smoke appeared. Then a flame emanated from this cloud.
500 meter altitude - 11.6 km visual obstacle
800 meter altitude - 10.4 km visual obstacle
1000 meters altitude - 9.7 km visual obstacle
Let us go over to Europe (the explosion took place at 7:15 - 7:20 local time, therefore it was 0:15- 0:20 am in London, at an elevation of 7 km):
The object, nearly "as bright as the Sun", caused the following reports from Europe:
In London on the night of June 30th the air-glow illuminates the northern quadrant of the heavens so brightly that the Times can be read at midnight. In Antwerp the glare of what looks like a huge bonfire rises twenty degrees above the northern horizon, and the sweep second hands of stopwatches are clearly visible at one a.m. In Stockholm, photographers find they can take pictures out of doors without need of cumbersome flash apparatus at any time of night from June 30th to July 3rd.
In Berlin, the New York Times of July 3rd reported unusual colors in the evening skies thought to be Northern Lights:
"Remarkable lights were observed in the northern heavens ... bright diffused white and yellow illumination continuing through the night until it disappears at dawn."
http://www.bibliotecapleyades.net/ciencia/esp_ciencia_tunguska02.htmhttp://www.nuforc.org/GNTungus.htmlThe visual obstacle from Tunguska measures 7463 km; we are told that the rays of light from the Sun (and it was morning over Siberia on June 30, at 7:20 am) cannot reach, for example, London, at the same time, due to the curvature; then NOTHING could have been observed/seen from Tunguska as well on a globe; an explosion on one side of a globe could not possibly influence in any way visual observations on the other side of the same globe; the visual range limit for the Tunguska explosion, on that cloudless day, is just 400 km.
Newspapers could be read at midnight in London, photographs could be taken outdoors in Stockholm without flash apparatus; no other meteorological/astronomical phenomenon occurred at that time in the world, no such records exist.
That is why this is the very best proof that the surface of the Earth is actually flat.
Amazingly, even the original trajectory of the ball lightning which caused the explosion, was seen all the way from London:
“TO THE EDITOR OF THE TIMES.”
“Sir,--I should be interested in hearing whether others of your readers observed the strange light in the sky which was seen here last night by my sister and myself. I do not know when it first appeared;
we saw it between 12 o’clock (midnight) and 12:15 a.m. It was in the northeast and of a bright flame-colour like the light of sunrise or sunset. The sky, for some distance above the light, which appeared to be on the horizon, was blue as in the daytime, with bands of light cloud of a pinkish colour floating across it at intervals. Only the brightest stars could be seen in any part of the sky, though it was an almost cloudless night. It was possible to read large print indoors, and the hands of the clock in my room were quite distinct.
T.R. LeMaire, a science writer, continues this thought, by suggesting "The Tunguska blast's timing seems too fortuitous for an accident" (LeMaire 1980). He claims that a five-hour delay would make the target of destruction St. Petersburg, adding that a tiny change of course in space would have devastated populated areas of China or India.
Can we assume that the 'pilot' chose a cloudless day with excellent visibility from aloft to assure a safe drop? American Military strategy called for identical weather conditions; for a perfect strike on Hiroshima's industrial heart, the Enola Gay's bombardier was forbidden to release through a cloud cover: he had to see the target below. To maximize blast destruction, minimize radiation perils: the bomb was set to explode at a high altitude rather than against the ground. Similarly, the Siberian missile detonated high in the air, reducing or even eliminating fallout hazard (LeMaire 1980).
LeMaire maintains the "accident-explanation is untenable" because "the flaming object was being expertly navigated" using Lake Baikal as a reference point. Indeed, Lake Baikal is an ideal aerial navigation reference point being 400 miles long and about 35 miles wide. LeMaire's description of the course of the Tunguska object lends credence to the thought of expert navigation:
The body approached from the south, but when about 140 miles from the explosion point, while over Kezhma, it abruptly changed course to the east. Two hundred and fifty miles later, while above Preobrazhenka, it reversed its heading toward the west. It exploded above the taiga at 60º55' N, 101º57' E (LeMaire 1980).
Tesla ball lightning device details:
http://www.cheniere.org/books/part1/teslaweapons.htm