Display mechanism (10) for a timepiece (1000), with a leap year display integrated in a month display, comprising a control mechanism (3) that drives, once per month, about an axis (D), a month display wheel set (2) arranged underneath a dial (1), having a month window (1C) in a quadrant allowing the display of only one quarter of the month display wheel set (2), which completes one revolution in four years, and bears, on an angular sector of 90?, at least one characteristic leap year marking, and either carries indices, each arranged to indicate one month on a static month scale of the dial (1), or equidistant month markings, wherein one of the month markings is pointed to by a fixed mark of the dial (1).

A date and moon phase display mechanism for watches, including a date ring with an inner toothing arranged to be driven by a timepiece movement, or arranged to cooperate with a date ring with an inner toothing of a timepiece movement, this mechanism including a moon display wheel set held in position by a moon jumper, this mechanism including drive devices, which are actuated by this inner toothing during each rotation of this date ring, and which are arranged to drive this moon display wheel set by a first constant angular pitch during each this rotation of this date ring.

A timepiece movement, a calendar mechanism and device for indicating the sunrise and sunset that takes account of seasonal variations. The simple calendar mechanism includes a display mechanism for displaying the date and a display mechanism for displaying the month. The sunrise and sunset indicating device also includes an annual cam having a profile representative of the tilt of the sun with respect to the equatorial plane and arranged to be driven in rotation via the hour wheel set through a kinematic chain that passes through the month display device and has a transmission ratio of 1:744.