Circular - Rotating and hovering east to west and back again at night in Garden City, MI in the early 1980's.

OK, I've never seen anything strange before or since and still can't believe what I say to this day.  So, being the internet age and all, I thought I'd search for what I saw that night to see if anyone else reported it.  I think I found the exact "thing" I saw in the sky as reported on http://www.ufopicks.com/.
It was the early 80's and I was approximately 10 years old.  My older sister was in the phone with her friend and told me that there was a "flying saucer" outside.  I quickly ran to the front window (facing east) and saw what appeared to be either a relatively low flying circular craft with rotating lights (Like L.E.D.'s) slowing pacing in an exact line from west to east and then back again from east to west.  Or it was huge and much higher in the sky than it may have appeared.
It was a clear night.  The "thing" was right above our house on it's east to west and back again pattern of flying.  I was mezmorized.  I was old enough to know that it wasn't a plane or copter.  It made no noise and very smoothly went about it's business.  I didn't see it "exit" the aky because it would come into view for a minute or two before going over the horizon and back again... then at one point it never returned from the horizon.  It seemed as thought it was surveying the area because of it's straight back and forth flight... it would move just a little to the south on each and every "trip".
FYI... this "thing" was somewhere in between Warren and Ford Road (east - west roads) and seemed to disappear from the horizon once it hit Inkster Road (to the east) and Middlebelt Road (to the west)... due to the horizon being limited because of houses and trees.
Here is the exact location of where I was viewing this object:
 http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=6607+Deering+Garden+City+Michigan&sll=42.328981,-83.314819&sspn=0.100384,0.21595≷=us&ie=UTF8≪=42.335073,-83.316836&spn=0.025094,0.053988&z=15&iwloc=addr  
If anyone else remembers the exact year or can add to my memory, please do so.  I KNOW I saw it, as did my sister and the friend on the phone that lived about a half mile to our west.
The exacty description of the "thing" was a perfect circle with LED type of yellowish-red lights that rotated around this "thing"... It seemed to have a top and bottom (both circular)... with the LED's (or whatever) around the middle.  I could not make out the body of the "thing" because the lights were too bright.
I'm not crazy... really. It was there. My best guess is that it was between 1980-1983.
Thanks for your time.
Source of report indicates that the date of the incident is approximate.  PD