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About two months ago I saw a dark grey triangle at night, almost imperceptible.
It was just above the low clouds, so assume 2,000 feet high.
The angular size of the triangle was around 45 degrees.
It sped through a big portion of the sky in about 5 seconds.
Doing the math, each of the three sides was at least 600 feet, and was moving at 18,000 miles an hour.
Completely silent, of course.