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The perpetual calendar window of the Rotonde de Cartier Astrocalendaire is another impressive watch feature, with its perpetual calendar window resembling an amphitheater and designed to be read with exceptional clarity. Traditional perpetual calendars show twelve months, seven days of the week, dates, and years in a small space with a diameter of just a few centimeters, which makes them hard to read. The new perpetual calendar window solves all these issues.

Thanks to the three-dimensional, multi-layered concentric circle design, the functions of the perpetual calendar are revealed layer by layer: the day of the week is on the first layer, the month is on the second level, and the date is on the top. The delicate display windows are arranged in a stepped fashion. For the final function of the perpetual calendar, the year, a hand on the case back shows whether it is a leap year.

The movement gear structure of the watch is a milestone in watchmaking history, solving all the operational and ergonomic issues of this type of complication. Going beyond the design limits of traditional perpetual calendars, this watch introduces new technologies to prevent damage, correct errors, and improve timekeeping functions.