Huge cylinder silently crosses the sky.

Walking through the back yard. Glance up and see this huge cylinder crossing the sky in a very unusual manner. Slow moving but making a great distance in a short time. Hard to describe the movement. Stared in awe for 10 seconds, then quickly checked my pockets for my cell phone. Not carrying my phone I stare for a couple more seconds and then realize I need to get a witness to this event. Run inside, grab my youngest daughter and show her as the cylinder continued strange floating movement into the eastern horizon then disappearing. Cylinder was very large and very high in the sky. I estimate 1 km long and about 200 meters high. Could see the structure and surface as well as white lights. Very strange and first time I have ever seen any thing like this. Cylinder was moving from west to east and seemed to be lower at first and then gained altitude as it moved eastward. Completely silent.