I was out front of my house with a friend smoking a cigarette and watching the evening arrivals to Sky Harbor. I first spotted the light at about 30 degrees above the horizon. It stuck out because of it's apparent speed and lack of visible nav lights. As a pilot and lifelong aviation enthusiast I'm pretty familiar with how things should look in the sky and something about the size, speed, color just didn't seem right.Several ideas passed through my head lantern, ballon with lights, aircraft with lights off. Just as quickly as I could think of explanations I would rule them out. As we continued watching it the light passed almost directly over our heads and continued to the west where it either passed into a cloud bank or faded out about 45 degrees above the horizon. Also it was totally silent. We could hear plenty of planes that evening but nothing from that object.