Two lights moving in symmetry.

I noticed two red lights in the sky. They were holding still. If a line was drawn between the lights connecting them, it would be at about a 30 degree angle to the horizon. They stayed in this position for about 30 seconds. I called my kids to see it. We watched the lights remain at this 30 degree angle until they started to drift away from each other. Each light move at the same pace as the other light. They each moved symmetrically away from each other, but remained in that 30 degree angle. Then the lights rotated around each other symmetrically. One light went lower as the other light went higher. Each light's movement and speed mirrored the others. This rotatation was about 180 degrees and only took the lights 3-5 seconds to complete. The lights then moved upwards and west into a cloud bank. I did not see the lights again. No sound was heard.