Silent metallic orb flies by at a consistent rate and path

I was at work one afternoon, looked up in a clear blue sky and saw a shiny round metal ball silently traveling above my head a few hundred feet high. Didn’t have time to get a camera out but it was traveling at a moderate speed within my vision for maybe a minute and a half. Perfectly round, very shiny, absolutely silent. I looked it up on Google, but there are videos of it. It’s called the San Diego sphere I have seen it.