Distant, grey object that was at least circular frozen in air for short duration until it flew off extremely quickly.

I was outside in the summer in my backyard. It's been a while, so I'm most likely misremembering the date, but I know it was around 1 p.m. or so. I was just bored as heck, standing around and sitting in a swing-chair, until I walked across my backyard to where I can see above a nearby neighborhood and the trees, where I saw a fairly distant (a few miles most likely) grey, mostly flat object that had what looked like a dome, but it seemed to be at an angle pointing a bit towards me but not entirely. I've good distance vision despite bad eyesight, and I saw it stay still for half a minute, but caught it flying off due west so quickly that it was a blur. I wish it was a tad closer for more detail, but I assume it was there for longer before I looked at it. I've no idea, but I soon went inside while just trying to not acknowledge it.