I witnesses an object in the western sky around 10:30 am. it was a cloudless morning and the object moved slowly to the north. it appeared to be far away. since i could not judge the size of the object i could not estimate its altitude although it appeared to be at least as high as the commercial airliners that occasionally passed by in the northwest sky. the object looked like an inverted pyramid, white and slowly rotating. i could tell that it was rotating because every 2-3 minutes one of the side would reflect the light of the sun. it stayed in the northern sky for approx. 1/2 hour, then moved a short distance to the west. at that point it gradually got smaller until it disappeared from sight. the camera on my phone was unable to pick up the object as it was small in the sky although unmistakably pyramid shaped.