This application uses your location and the awesome Heavens-Above website to calculate the next observable Iridium Flare.
What is an Iridium Flare?
It's kind of like a predictable shooting star. If you're in the right place at the right time it can be very impressive.
According to Wikipedia it's -
"The phenomenon caused by the reflective surfaces on satellites (such as antennas or solar panels) reflecting sunlight directly onto the Earth below and appearing as a brief, bright flare."
Enjoy and Happy Hunting