Why is so much time being wasted on what the light was, that was being observed, the explosion or the aftermath or what-have-you? What difference does it make? Curvature would have blocked it out regardless.
The thermonuclear 'explosions', if fake, add value in that we know even less than we realize about explosions.
In order to claim that curvature would have blocked the light coming to London you need to know where the source of the light first. If the source of the light was actually above the observers like for example in the case of aurora then there is no point bringing in curvature. The phenomena could happen on round earth as well. But if you have some evidence that show the light source was in Tunguska, then you can argue that the earth is flat.
Talking about the aurora borealis, which stems from the solar particles hitting the upper atmosphere, presents such a terrible, awful example... The sun is a much larger object than the particular body which caused the event. The event occurred in only one area, and the light spread outwards. light only, not particles like solar flares.
You are trying to change the subject from the event to the aurora borealis where you just say, "see, it has lights."
Instead of focusing on a sun with a greater distance from earth (seen by everyone in FE and RE theory alike) be realistic and focus on the explosion that occurred at 7 km. That should not have been seen. Neither should the light from the area have been seen.
Auroras are unrelated.
The Aurora and this event are so unrelated and different that your comparison makes no sense. Please note the different colors of an aurora borealis, please note the wave like shapes. Also notice, how an aurora never gets as bright as that.
Once again, solar particles, which hit a large area from solar flares, and impact areas with temperatures totaling millions of degrees stand completely different from each other. The sun, being seen by everyone, can emit particles that affect large areas. That scenario just poses a big DUH... Tunguska was just one localized event within the earth's atmosphere and close to the ground.
Provide just one shred of evidence that an impact from an object and solar particles hitting the upper atmosphere are the same scenario.
The explosion came from just one area... Solar particles bombard many different portions of the atmosphere at the same time...