Zig-Zagging light similar to star moving around other stars changing intensity as if looping in/out light range

Reported By: ((name deleted))-Chandler, AZ.  -  November 3, 1999  -  6:36 PM Subject: UFO Sighting  &  Unexplained Event  -  Event Location: Newport, Oregon  -  Time of event: 9-10pm Date: 6/77-7/77 - Additional Info: at the beach  - Witnesses: 1 - Objects Shape: Light  -  Number of objects: 2 Event Description: I'm originally from Pa. and went to Oregon for vacation in 1977 when I was 17 with my brother who was on leave from the air force, so a more exact time frame is obtainable. The only other witness I know of is a guy from Walla Walla, WA. who I met in the campground we were staying, but they left before we woke up the next morning, so any actual confirmation would be from someone I never met before or saw after. You're the only ones I've ever submitted this to, although I've told many over the years.
After having dinner on the beach this guy and I went around a pile of driftwood to do some stargazing (nothing else!). We watched what looked just like a star "moving around other stars" in erratic sharp turning patterns, except it would get brighter and fainter as it "moved in & out of light range." We looked away and then back minutes later and it was still there, but it started to arc toward the south then stopped and continued its erratic movement. We continued to watch until it started to arc again and met another similar light which traveled straight in the opposite direction.(probably a satellite)   We watched it straight above for about a 20 min, looked away for about 5 min, watched again for 10 min before it started its 1 min arc to about 10:00 in the sky, where it stayed for 10 min and we looked away again for 5 min then back for 2 min until it moved to intercept the other northerly arcing light. We left after they were straight above us, it got way to weird.
Just to point out the important parts again. It was star like and was constantly moving in a sharp erratic pattern around and past fixed stars and in and out of light range indicating depth in space. We watched it for an hour or more. The only one to verify it is someone from Walla Walla. A more exact date probably could be obtained. I'm not insane and it still tingles my spine when I talk about it.
Time and date are approximate.  PD