Weird large circular thing in the sky traveling North to South from where we were standing - Very high up - Very large object

My husband spotted a very large circular object in the sky around 5:15 pm on Feb 3rd in South San Jose, CA while he was driving. He snapped a picture, but the photo is very grainy because the object was very high up in the sky. When he got home told me about it and we both went out in the backyard to watch it. We both watched it until it finally disappeared becuase it had traveled too far away and too high up for us to see it anylonger. It was traveling North to South from where we were standing in our backyard.