I observed a large triangular shaped object in 1983 in the same area and with identical characteristics described in a 2005 report.

This report is submitted only after reading an existing report dated September 19, 2005.  I too was in Boulder Colorado, watching the night sky, at approximately 2130, in a park near Boulder Canyon.  There were only a few lights on at the time in the area so that my vision of the night sky was not obscured.  I too saw a very large (probably the size of a football field) triangular / boomerang shaped object cross the sky above me – going from west to east (I know because I was near the mountains and the object came from over the mountains).  It was very large, traveling surprisingly slow, and at an altitude I would guess to be less than 1,000 feet.  There was no sound associated with the craft, there were no lights visible at all, and it was very dark in color.  The only way I knew the craft was there was because I noticed it block out the stars above it as it passed in front of them directly above me.  I focused in on it and observed the very distinct outline of the craft and watched it maintain a straight course for 10 seconds until I lost sight of it as it passed directly over the City of Boulder.  It startled me so that I immediately went to a pay phone and called the Boulder Police Department.  Dispatch for the Boulder Police Department informed me that they had recently received over 20 calls already on the same observation.
 This wasn’t 2005 as was the case of the report that has caused me to file this report – My experience was in 1983.  Unfortunately I don’t recall the exact day.  I can only guess that it was late in the year, very possibly September.  I do know that I saw a craft, however.   I had recently spent 4 years in the Navy and was familiar with every type of ‘publicly known’ military aircraft, and this fit the profile of none of them.  I have since gone on to develop a career in the Navy and have spent a great deal of time in a flying status.  To this day, I cannot identify a possible aircraft profile that I know of that is similar to what I saw in 1983.
Witness indicates that the date of the incident is approximate.  PD