We were walking South along the Desert Trails Golf Course in the NW edge of Sun City West, AZ. When we first observed (my wife & I) this large, Bright object hanging motionless in the western sky about 20 deg. above the horizon. You couldn't not notice it. it was larger and brighter than anything I have ever seen in the sky. The sun had just set and it was still very light out. To describe the size I would say it looked the size of Nickel held between your fingers at arms length. Even tho I knew it couldn't be a star I looked to the Eastern horizon and no stars were yet visable. At around 7:50 PM It was still there as we turned east to return home. There was nothing in the news,on radio or TV. I am 79 years old, was an Air Traffic Controller in the USAF for 18 years. I was also a licensed pilot with private/commercial/multiengine/instrument rateings. The sky was mostly clear with a few low thin clouds.