Bright light getting brighter and shrinking to its' center a beacon went back and forth across the skyAs I was talking on the phone a very bright light appeared and I told the person on the phone what I was seeing and almost immediately it disappeared. It soon returned in the exact place where I had seen it before, it became very bright, a beacon type light could be seen going back and forth. It became very bright only to shrink to it's center as if it moved away very rapidly. This happened 5 times in approximately 20 minutes. Same location in the sky. I stayed in the same spot and even went outside to a line of site in line with the position I had inside. The light was appearing just behind a row of trees, I made certain that the light re-appearing and disappearing was not just the trees getting in the way. When the light was at its brightest it appeared to change colors on the outer edges from a brick red to an amber yellow.((NUFORC Note: We spoke with the witness. Probably Venus in the western sky. PD))