Timepiece comprising a clock movement and means for indicating the sunrise and sunset taking into account seasonal variations, said means comprising a sphere representing the Earth, a support, and a circle mounted on the support and arranged concentrically to the sphere, wherein the circle is arranged to indicate the position of the Earth's terminator, the circle and the sphere are arranged to be able to pivot in relation to one another around two perpendicular axes (X-X, Y-Y), a first of the two axes, referred to as polar axis (X-X), corresponding to the polar axis of the Earth, and the second axis, referred to as ecliptic axis (Y-Y), crossing the polar axis at the centre of the sphere, wherein the circle is free to pivot in relation to the support around the ecliptic axis; the means for indicating the sunrise and sunset comprising a shell arranged concentrically to the sphere that represents the globe, wherein the shell is arranged to delimit a part of the globe where it is night time from another part where it is daytime, the shell having the general shape of a half-sphere and having a generally circular edge, wherein the edge forms the circle arranged to indicate the position of the Earth's terminator; the means for indicating the sunrise and sunset also comprise a year cam having a profile representing the inclination of the sun in relation to the equatorial plane and arranged to be driven in rotation by the movement at a rate of one revolution per year, a cam follower arranged to cooperate with the cam, and a kinematic link arranged to connect the cam follower to the circle so that with the polar axis (X-X) the plane subtended by the circle forms an angle equal to the angle of inclination of the sun in relation to the equatorial plane, wherein • the support is arranged to be driven by the movement in order to revolve at the rate of one revolution every 24 hours around the polar axis (X-X) driving the circle; • the means for indicating the sunrise and sunset comprise a differential mechanism and a drive shaft concentric to the polar axis (X-X) and connected to the output of the differential mechanism so as to be driven in rotation by the movement by means of a first input of the differential mechanism at the same rate as the support but with an angular displacement in relation to the support; • the cam follower is connected to a second input of the differential mechanism such that the angular displacement of the drive shaft represents the inclination of the sun in relation to the equatorial plane, wherein transmission means (39; 41) are also arranged between the drive shaft and the circle so that a change in angular displacement leads to a corresponding change to the value of the angle between the plane subtended by the circle and the polar axis (X-X); characterised in that the ecliptic axis (Y-Y) is substantially collinear with a diameter of the circle, and in that the shell bears two pivots extending the two ends of the diameter, wherein the two pivots are pivoted on a first and a second arm (33a, 33b) respectively of the support. • the support is arranged to be driven by the movement in order to revolve at the rate of one revolution every 24 hours around the polar axis (X-X) driving the circle; • the means for indicating the sunrise and sunset comprise a differential mechanism and a drive shaft concentric to the polar axis (X-X) and connected to the output of the differential mechanism so as to be driven in rotation by the movement by means of a first input of the differential mechanism at the same rate as the support but with an angular displacement in relation to the support; • the cam follower is connected to a second input of the differential mechanism such that the angular displacement of the drive shaft represents the inclination of the sun in relation to the equatorial plane, wherein transmission means (39; 41) are also arranged between the drive shaft and the circle so that a change in angular displacement leads to a corresponding change to the value of the angle between the plane subtended by the circle and the polar axis (X-X);