At dusk, a light appeared out of the SE sky arched down above the E horizon moved NW.

July or August 1958 (could have been 1959) at my home in Lake Hills, Bellevue, Washington.  The time was about 9:30pm.   It was dusk but enough light in the western sky to see the profile of the Olympic mountain range.  I was in my back yard which faced west. Most of the sky was dark, the weather was clear as it often is in the Northwest this time of the year.
A light suddenly appeared to drop out of the southeastern sky.  It seemed to be more intense than the brighest star.  The light arched down toward the horizon in the southern sky travelled west, then toward the northwest as it stayed low (about 15deg above the horizion).  It then passed behind a local  batch of fir trees, about 6 blocks away.  It came into view again from behind the trees at the same altitude and then it passed over the local hills (Cougar Mt & the hills above Eastgate) eventually moving towards the city of Seattle, passing under or  level with a rising full moon.  The intensity did not seen to change as it moved further away.  It seemed to turn slightly north and finally disappeared from my sight behind local terrain to the northwest of me.  No object was seen, just the light, which was very bright and white, with a very constant intensity.  There were no green or red colors assiciated with it.  It appeared to move much faster than any airplane and there was absolutly no sound.  Any jet powered airplane could have been easily heard as the evening was quiet and the object appeared to be within a mile or two at the nearest part of its flight path.  It moved at quite a high speed and it covered at least 25 to 40 miles inside of one minute.  The light was not a reflection off the object, the object was definately the source.  Never heard about anyone who might have been a witness nor was there a mention of the event in the local press.
The incident occurred  in 1958 or 1959.  Exact date is not known.  PD