What did I see ?

Three nights ago at about 8 pm while setting up my scopes I seen a very bright object passing overhead. I "as fast as I could" got an image of it in my six inch. Note, that I have seen this before but never through a scope. It was moving from the northwest to the southeast, I thought it would be an airplane or jet but as far as I could tell this was not to be. It was hard to keep it in the field of view and get a focus at the same time. Finally, I was able to see it. A single, very bright, round disk with a checkerboard or window screen as the detail, about the size of jupiter at 120X "there were no clearance lights". With my naked eye it was at least as bright as mars and perhaps a little brighter. There was no "beam" of light as though it were shining straight down just blueish white light with the same intensity throught-out the time I could see it. I caught a glimpse of this same thing about a month ago with no scope nearby. It traveled west to east but varied in brightness almost on/off. Thats my story, wish I had more but maybe someone else can add to it or seen it too.......