(In more depth: the perpetual calendar keeps the day, date, and year accurate without additional setting until the year 2100! Meanwhile, the split-seconds chronograph—or rattrapante, if you’re feeling fancy—is a stopwatch feature that utilizes two hands. When you start the chronograph, the hands are stacked atop one another, but pressing the button again acts like the “Lap” button on your iPhone’s stopwatch: the split-second hand will stop while the main hand continues its way…

