Exquisite Timing

摘要

It's a leap year, and the leap day falls on a Saturday. That means for collectors who own perpetual calendar wrist-watches, there's free time to luxuriate in a phenomenon that happens only once every four years: the "February 29" month and date clicking into place.Miniature mechanical marvels, perpetual calendar watches accurately track the hours, minutes, and seconds, as well as the day of the week and date, always taking into account months with different numbers of days and leap years. Most such watches will precisely track time without needing an adjustment until March i, 2100, when the leap year that should take place won't occur so our Gregorian calendars are realigned with solar time. Considered high complications in the world of horology, perpetual calendars are among the most challenging watchmaking feats.