The Rolex Sky-Dweller is an annual calendar invented in 2012.The Rolex Sky-Dweller contains the in-house Caliber 9001. The second time zone is indicated by an off-center, rotating 24-hour disk. Local time, indicated by the center- mounted hands, can be adjusted quickly when you change time zones by setting the hour hand   forward or backward in one-hour increments. The minutes, seconds, and second-time-zone indicators are not affected during this operation.The calendar mechanism, which changes instantaneously is relatively simple, Rolex says: the company has added just two gear ratios and four gear wheels to its existing instantaneous date calendar. As Rolex explains it, The mechanism is designed around a fixed planetary gear wheel at the center of the movement. A satellite wheel engages with the planetary wheel and rotates, orbiting the planetary wheel in one month, driven by the date disk. The satellite wheel is fitted with four fingers for the four 30-day months.

The movement has 380 components and is protected by seven patents, four of them new.The case is 42 mm in diameter and water-resistant to 100 meters. This Rolex Sky-Dweller comes in white gold and leather straps, and in a version with case and bracelet made of Rolex’s proprietary Everose gold.The gear ratio between the satellite wheel and the planetary wheel is calculated in such a way that at the end of each 30-day month – and only in these months – one of the satellite’s fingers receives an additional impulse from the date-change mechanism. This makes the calendar disk jump two days  within a few milliseconds to display the correct date. Rolex has dubbed the mechanism “Saros,” a Greek word that refers to the approximately 18-year cycle that can be used to predict when eclipses will occur.

Rolex chose the name because it brings to mind the revolutions of the Earth and moon, which are like the motion of the satellite wheel with its four fingers. The Rolex Sky-Dweller calendar has an unusual month display. The hour numerals correspond to the 12 months of the year. Next to each numeral is a window. The window for the current month is black; the other 11 windows are white.

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