Matte black thick disc probably 20-30' in diameter observed in the western sky below sun level by 5 degrees , i could see the suns light reflect off the drab exterior , it appeared to be a good mile away judging by the reflection of the sun and elevation at probably 2500 to 3500 feet above sea level . i spotted it thinking it was a hawk or vulture gliding on a heat wave as we had a nice day here today , but upon further looking this was no bird!! it was smooth and matte finish, i pulled over to get my binoculars but in an instant it was gone, i did not observer the departure