A horology calendar system (200) including:a date wheel (1);a month cam (300); anda kinematic connection element (8) arranged so that the date wheel allows the driving of the motion of the month cam. Optionally, the kinematic connection element is arranged so as to allow the driving of the month cam by at most 1/n of a step while the date wheel is driven by one step, where n is a natural integer greater than 1.

A calendar mobile (10) indicating time information or information derived from the time, comprising at least one first obstacle element (1a, 2a, 3a) intended to receive a driving contact action driving the calendar mobile and/or intended to transmit a driving contact action from the calendar mobile, the first obstacle element being made of titanium or of titanium alloy, the mobile being a disk or the mobile having substantially the shape of a disk or the mobile having substantially the shape of a disk ring.

A timepiece movement includes second, minute, and hour hand wheels with second, minute, and hour hand arbors; a 24-hour hand wheel with a 24-hour hand arbor; and a first to third guides that guide an arbor to which a hand attaches. The minute, hour, and 24-hour hand arbors have tubular configurations and are disposed coaxially to the second hand arbor. The minute hand arbor has a diameter greater than the second hand arbor, the hour hand arbor has a diameter greater than the minute hand arbor, and the 24-hour hand arbor has a diameter greater than the hour hand arbor. The first guide is between the second hand arbor and the minute hand arbor, the second guide is between the minute hand arbor and the hour hand arbor, and the third guide is between the hour hand arbor and the 24-hour hand arbor.

A timepiece movement includes second, minute, and hour hand wheels with second, minute, and hour hand arbors; a 24-hour hand wheel with a 24-hour hand arbor; and a first to third guides that guide an arbor to which a hand attaches. The minute, hour, and 24-hour hand arbors have tubular configurations and are disposed coaxially to the second hand arbor. The minute hand arbor has a diameter greater than the second hand arbor, the hour hand arbor has a diameter greater than the minute hand arbor, and the 24-hour hand arbor has a diameter greater than the hour hand arbor. The first guide is between the second hand arbor and the minute hand arbor, the second guide is between the minute hand arbor and the hour hand arbor, and the third guide is between the hour hand arbor and the 24-hour hand arbor.

A wristwatch (an example of a timepiece) includes a small dial (an example of a dial) and a rotary disk (an example of a rotary member). The small dial includes a sun mark for displaying the state of the sun. The rotary disk covers the small dial and rotates in a 24-hour period. The rotary disk includes the sun state indicator that changes the visibility of the sun mark in accordance with the rotational position of the rotary disk. One of the small dial and the rotary member includes a plurality of numbers (an example of indexes) for indicating time. The other of the small dial and the rotary member includes a time indicator that indicates a number in accordance with the rotational position of the rotary disk. The time indicator and the sun state indicator are disposed relative to each other in a positional relationship such that the visibility of the sun mark by the sun state indicator corresponds to the state of the sun corresponding to the number indicated by the time indicator.

A wristwatch (an example of a timepiece) includes a small dial (an example of a dial) and a rotary disk (an example of a rotary member). The small dial includes a sun mark for displaying the state of the sun. The rotary disk covers the small dial and rotates in a 24-hour period. The rotary disk includes the sun state indicator that changes the visibility of the sun mark in accordance with the rotational position of the rotary disk. One of the small dial and the rotary member includes a plurality of numbers (an example of indexes) for indicating time. The other of the small dial and the rotary member includes a time indicator that indicates a number in accordance with the rotational position of the rotary disk. The time indicator and the sun state indicator are disposed relative to each other in a positional relationship such that the visibility of the sun mark by the sun state indicator corresponds to the state of the sun corresponding to the number indicated by the time indicator.

Disclosed is a display mechanism for a timepiece, including a frame, an aperture which is fixed relative to the frame and a first and a second display disc each bearing indications, characterized in that it makes it possible to display the indications of the first and second discs alternately through the aperture. The invention also relates to a timepiece movement including such a mechanism, and to a timepiece such as a wrist watch, a pocket watch, a clock or a miniature clock including such a timepiece movement.

A timepiece movement includes a date indicator for date display, a date indicator driving wheel for advancing the date indicator, a lunar age indicator for lunar age display, and a lunar age indicator driving wheel for rotating the lunar age indicator. The date indicator and the lunar age indicator are coaxially disposed, and the date indicator driving wheel and the lunar age indicator driving wheel are coaxially disposed.

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 pointer including a pointer body formed of synthetic resin, and a pointer attachment section formed of a material harder than the synthetic resin and provided in a rotation center portion of the pointer body, in which the pointer attachment section comprises a large-diameter section to which the pointer body is fixed and which includes a positioning section, and a small-diameter section which is provided coaxially with the large-diameter section and to which a pointer shaft is attached.