I live in lampasas 70 miles north and a little west of austin tx. at about 1845CST I was in my backyard talking to my wife. I noticed a bird in the east and followed it toward the south. That is when I saw multipe objects and commented to my wife. She saw them also. They seemed to be traveling east to west. My first thought was they were a group of missles/rockets, then aircraft, then in unison they stopped in the sky roughly East South East(more east than south) of my position. At that point I was 100% sure I was not looking at at known conventional aircraft, ballons,birds or flares... Using the horizontal as 9 o'clock the objects were at about 11 o'clock. Estimate height at 30-40000ft. Actual Height is unknown as I had no refernce for size other than the "vapor trails". Distance from my observation point is unknown(Maybe 10-20 miles). The objects moved at multiple angles to initial trajectory. Appeared to fade out and reappear, forming geometric shapes. I beliveve the obects were reflcting light from the setting son. They all stayed in same patch of sky, 2, 3 or 5 would wander south a bit away from main group. then disappear and reapper in main group. As time went on there were less in the sky. 12 down to 10 down to 7,6,5,4,3,2,1. eventually all disappeared. I stayed and watched until all were gone. The show lasted about 20-25 minutes.I served 20 years in the US army. Trained in security/observation/surveillance. Please contact me cell phone or primary email listed. I will talk to third parties(selective).