Upon first use, the hometime is defined by moving the reference city to the red triangle at 6 o’clock via the pusher at 8 o’clock. With each push, everything from the cities and the cut-out continents, the underlying day & night disc as well as the hour hand turns together. The minutes of the hometime are set via the crown. When travelling, the new local time zone is simply placed at 6 o’clock via the pusher at 8 o’clock, which works in 1-hour jumps without affecting the minutes.