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.