Alexander Nevsky 5 april 1242 year. On the ice of lake Peipus the soldiers of Alexander Nevsky fiercely fight with the teutonic knights, trapped in the iron. In the midst of the battle of dark northern part of the sky suddenly became lighter as if somewhere on the far horizon lit a giant torch, the flame of which sways in the wind and is about ready to go out. Then the sky cut a long green beam and immediately disappeared. After a moment above the horizon appeared a shining green arc. It grew brighter, up... AND spurted from her down-to-earth, the sheaf of the bright rays of - reddish, pale-green, violet. A faint light shone what is happening on the ground, on the ice of lake Peipus... Later the chronicler to note that in that day upon the aid of the russians came the "shelf of god of hosts". They are inspired by Alexander Nevsky on the victory. In short, the perception of unusual natural phenomenon is quite in the spirit of understanding of the world, characteristic of the people of the 13TH century.