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Energy needed to create a second sun

To an explosion to be seen as "Second sun" from the moon surface.
Let's assume spherical explosion, where all energy is converted into radiation. Distance between observer and explosion is R, Irradiance(roughly speaking, how bright it is) is E, duration of time when explosion was such bright as t. Total energy of explosion would be equal to 4*pi*(R^2)*E*T.
I assume that explosion center is on Earth, and it shined for 1 second as bright as Sun. Distance would be 380,000km, irradiance 1361 W/m^2(Solar irradiance at distance of Earth). Explosion energy would be 4*3.14*(380000000^2)*1361*1=2.47*10^21 joules, or 590 gigatons of TNT(Large Island level)
 
Where explosion originates? How long does explosion looks like as bright as Sun?
Sorry late answer

The battlefield is Mount Everest, flattened completely by the clash. Their fight creates a crater so enormous that even the Mariana Trench could not fill it. The crater reaches 20–30 km below the visible base of the mountain.

The build-up light shines for roughly 10 seconds, followed by the full explosion lasting 1 minute. The resulting “second sun” illuminates the entire atmosphere.
 
Sorry late answer

The battlefield is Mount Everest, flattened completely by the clash. Their fight creates a crater so enormous that even the Mariana Trench could not fill it. The crater reaches 20–30 km below the visible base of the mountain.

The build-up light shines for roughly 10 seconds, followed by the full explosion lasting 1 minute. The resulting “second sun” illuminates the entire atmosphere.
Could you please drop link to this media?
 
If buildup was linear, and irradiance was constant for 1 minute, it's full 65 seconds. 38 Teratons, Country Level
just the light/explosion? could you maybe calculate the full effect? like they create a crater 20-30 km deep from mount everest and other factor?
 
just the light/explosion? could you maybe calculate the full effect? like they create a crater 20-30 km deep from mount everest and other factor?
Comparable event is Chicxulub asteroid(one that killed dinosaur). It initial crater depth was 30km. It's energy estimate are in range of 310 Terratons- 13 Pettatons(from Large Country to Multi Continental)
 
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