Light from the east moving at incredible speed, then comes to dead stop.

I was sitting on the patio outside my cabin just after dusk. The ship was moving south and i was on the port side on floor 9. My eyes caught a white light moving east to west. It was 15-20 degrees above the horizon and moving at an amazing speed in line with the horizon. I am a private pilot and live 15 miles from Luke AFB. See fighter jets all the time. Have never seen anything move this fast. And light suddenly stopped completely. It sat still for maybe a second. Then slowly went straight up and back to the east. It was gone from sight in a split second. I cannot possibly emphasize the speed it was moving
when it came to a complete stop. I would be amazed if the crew on the bridge did not see it as it would have been right on their port view. I have replayed this in my head a thousand times. Never seen anything like this. Thank you.