Sometimes the brilliance of artificial satellites and spacecraft experiences strong flares that are not associated with the inclusion

Sometimes the brilliance of artificial satellites and spacecraft experiences strong flares that are not associated with the inclusion of artificial light sources. Why does this happen if at this time the conditions for the illumination of the satellite by the Sun change monotonically, and the shape of the object is constant?

Glare flares occur due to specular reflection of sunlight from semiconductor battery panels in their respective orientations relative to the Sun and the observer.

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