Abstract: A watch having a civil time display (12, 16), a solar time display (13, 18) and a mechanism for correction (24, 34, 36) of these displays. The correction mechanism is arranged in such a way as to allow the relative desynchronization of the civil time and solar time displays. A way of displaying this desynchronization (20, 22) is provided.

Abstract: The invention concerns a watch equipped with means for determining a location longitude and a device for determining the sun's altitude above the horizon. Said watch comprises a mobile element (16) doing one full rotation in 12 hours and bearing a hour hand (24), and a dial (32). It comprises for this purpose a rotating ring (44) for reading longitude, bearing an index mark (47) and, therefrom, a scale (45) in degrees, extending from 0° to 90° on either side of the index mark and covering the ring (44) over its whole periphery. Moreover, the dial (32) is provided with a circular scale (33) for selecting a time zone, with a median point (35) corresponding to the dial top point and a graduation from 0 to +6 hours or ?6 hours depending on the rotational direction.