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How about an aircraft that is coming towards you for the 15 - 20 minutes with its landing lights on which is much further away than you thought and then makes a turn, or turns its landing lights out. Being twilight you may not see any navigational lights especially if its quite some distance from you. It would appear stationary if it was coming straight towards you until it got relatively close to your position.
You could also fire up a planetarium program and enter the date, time, direction you observed the UFO (doesn't mean extraterrestrial) and see what may have been in that vicinity.
I put my bet on the aircraft scenario.
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Darryl |