Two lights in sky seemed to play "tag"While travelling from San Francisco to Eureka, CA, at about 10 PM, my partner and I saw a single light travel across the sky; it was followed by another. These two lights seemed to play tag, one passing the other in a seemingly perfectcircle. We observed this phenomenon for about 20 minutes as we were travelling. A CalTrans flagger and a bystander that we passed were also engrossed in the lights as we passed them. I thought that it was a search light on clouds, but I could see no beam, and there were only spotty clouds. The lights seemed to be amorphous.