The light(s) will appear when gazing at the sky. Sometimes near the horizon, most of the time 45 to 90 degrees. At some point you just become aware of the light. It has a “brightness/brilliance” to it that catches your eye and is unlike the stars around it. The lights I have seen appear to rotate causing a “twinkle” effect. The light will appear to “grow” in circumferance, occasionally becoming very bright (once I saw the light with a companion and the light became so bright the thought crossed my mind of a helicopter spotlight). Sometimes the lights pulse from bright to dim, brighter, dimmer…eventually fading out. The lights varied in color. Most common was the white/bright light. I have seen blue lights as well.

As far as I am aware, Iridium satellites are not geosynchronous and geosynchronous satellites are not bright.

The one I observed was about mag 0 (constant) and was stationary for at least 5 minutes before it blinked out in an instant.

I’m confident it wasn’t any of the usual suspects: weather balloons, Chinese lanterns, aircraft.

Any clues or links to positional data on bright geosynchronous satellites would be appreciated.

http://www.heavens-above.com can predict iridium flares based on where you’re at. i.e. You have to register so that you can indicate your geographical location and time zone.