“Normally, the best times to see the ISS are within an hour or two before sunrise or after sunset. During those times your sky will be dark (barring urban light pollution) but the high-flying ISS can still be sunlit. In the evening the station will look brightest just before entering the Earth's shadow and suddenly "disappearing" partway across the sky. Early in the morning the ISS can abruptly "appear" as it emerges from Earth's shadow.”
Courtesy of http://science.nasa.gov/headlines/y2000/ast01dec_1.htm
I decided to actually look up why the Space Station fades from view as it passes overhead. I’m relieved to find out that my theory was right.
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