Straight down streak of white caught our left peripheral vision before it became white circle and gone.

11:45 am we were faced straight ahead watching Raiders game. We both exclaimed "what was that?" out the big window to our left. We often watch birds out there vie for a perching spot on that light pole on the next street over. Their approach is almost always horizontal, and a white one is very rare. We would say the streak was 1 - 20 miles to the east so probably much larger. The white streak and the white ball were unmistakable. A thick version of a nighttime shooting star. We are retired professionals who came here to live in the 60s.