It is very difficult to estimate the sizes of objects in the sky. I once saw an odd machine-like object in the sky of Shanghai, China in broad daylight. I thought, why is nobody concerned, or even looking? After awhile I saw it sway a bit and realized it was an anchored kite. I thought it was huge but it was just close. At night it lit up like this: https://youtu.be/O_UrmvcJ9T0