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Hi, Juergen. I'm sure others on the list will have better ideas, but...
Except
for the fast that you observed the phenomenon at the zenith, it sounds
remarkably like a high-atmosphere release test... These are done
infrequently to
test high-altitude airmass characteristics (I think?), and appear as
bright,
relatively fixed luminous spheres (or oblongs, where hialt winds are
high).
Should have occurred closer to the horizon, though, unless you're VERY
close to
air base where you observe. I'd be interested to hear other ideas, too!
Clear skies,
Lew
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