Noon is on the top on the front side.
Unlike traditional 24-hour watches, Vienna's black and white ring shows
the actual daylight hours for this locale.
And the gray zone indicates the nighttime hours when the Moon is up.
The small green hand shows the UTC time.
In Set mode, the upper pusher advances one day; the lower one advances one hour. To see an animation of the changing length of the day press and hold the day button; be patient, it's not very fast (except at high latitudes).
