We looked up in the northwest sky and saw a series of horizontal yellow/orange lights moving closer in the sky. There seemed to be from 3 to 5 lights on at one time, the one in the rear would go out and then there would be an additional one go on in front. This happened three to four times. Then they went out. Then it repeated about 15 seconds later. Then nothing. It lasted about a total of 30 seconds. No sound.