Today was a beautiful, blue sky day with only a gentle wind from the SW, one of those days when we have to fly even when we have nowhere to go. Anyhow, took the Arrow for a one hour flight that I justified by checking my cottage etc. While flying back toward Calgary I suddenly saw a very bright light at about my 11 O'Clock that sure did look like very close landing light. This lasted for about 10 seconds and then just as suddenly disappeared. I realized then that it had been the sun reflecting off a tall building in downtown Calgary, at least 30 miles away. I've never seen that before, has anyone else here seen such a thing?