Disclosed is a mechanical movement including an information display device including at least one indicator member for the information, mounted pivoting about a pivot axis A. The movement encloses a cavity receiving at least the indicator member, the cavity being arranged so that the indicator member is housed entirely inside the movement. The movement includes at least one mobile arranged pivoting coaxially with the pivot axis A and including an outer peripheral toothing, the mobile being housed in the cavity and arranged to carry the indicator member. The mobile includes a felloe including the outer peripheral toothing and defining an inner opening, the felloe carrying an arm passing radially through the inner opening in order to be mounted pivoting on the pivot axis A, the indicator member being represented on the arm. Also disclosed is a timepiece including such a mechanical movement.

A Moon phase and Earth phase display device (100) for a horological movement, which device includes a display (110) including a plurality of graphical representations (120) symbolising respectively different successive phases of a celestial body, a dial (130) provided with two apertures (131) arranged so as to concomitantly display two diametrically opposed graphical representations (120), one of which symbolises a Moon phase and the other of which symbolises an Earth phase, and a drive mechanism (140) configured to drive the display (110) in sequential movement.