Silver round object hoovering in the sky during daytime.

I was driving home and noticed a silver object in the sky.  At first I thought it was a blimp but I have been on blimps and this shape was round. I turned up the hill and kept thinking about how it was not a blimp.  
I turned around to get a picture but had to go down the hill and pull into a parking lot.  I saw an employee come out and said " look up there and tell me what you see".  It had disappeared.
The next day I told a coworker and he said the blimp went by but that was at 10am not 4pm.  I asked if it had Snoopy on it and he said "Yes".  No Snoopy here I saw all silver.