Idegesített, hogy lövésem sincs, mi villan az égen, kicsit gugliztam angol oldalakon. Itt
http://earthsky.org/space/i-saw-a-flash-in-the-night-sky-what-is-it#other találtam egy lehetséges magyarázatot: iridium műholdak beforduló fő antennáján csillan meg a napfény, ez az angol oldal szerint akkora villanásnak érzékelhető megfelelő szögből nézve, mintha a Vénuszt látnám (persze csak egy pillanatra

).
"Flashes from iridium satellites. In a dark location, especially just after night has fallen or is about to end, you often see ordinary satellites crossing the night sky, appearing as dim steadily moving “stars.” Sometimes one of them will produce a flash! That may happen when an antenna from an iridium satellite reflects sunlight directly down at Earth. When it does, it creates a quickly moving illuminated spot on Earth’s surface. The diameter of the spot is about 10 kilometers, or about six miles. If you’re standing inside this spot, looking up, you see what appears as a bright flash, or flare in the night sky. The flare lasts a few seconds, then is gone.
The flares from an iridium satellite can be bright – as bright or brighter than the brightest planet Venus. Some of the flares are so bright they can be seen in daylight.
It’s the unusual shape of iridium satellites, by the way, that causes them to flare on occasion. They have three polished door-sized antennas, 120° apart and at 40° angles with the main bus.
The forward antenna faces the direction the satellite is traveling. The flares come from these antennas."