Saw a large circular stationary object in broad daylight . It was a dark color and no sound

I was in my backyard and I saw some planes passing by.  As one passed by a dark circular shaped object was floating stationary off in the distance . I stared at it for many seconds and tried to capture it on my phone and my video wasn’t working at that moment.  For some strange reason.  It remained stationary then I got up to get a closer look.  And it began slowly moving to the left and then poof disappeared!