I saw powerful white light in horizont, with a north-south movement, from my house at first.the object was not the typical white and red lights flashing from helicopters or airplanes in flight.No sound, Time to lose visibility from my position 1 minute.When five minutes later I went down to the street, a plane was passing right by the position in which the object was before.I live near an airfield which is only active aircraft with sunlight (at the time of the sighting was night) and only operates in night helicopter and sometimes helicopters can carry a flashlight with a powerful white light on. I saw was not the case was different. The light I saw was different. The light did not emit a light beam of a spotlight & by the distance to the object made no sound.