rolexのインスタグラム(rolex) - 1月14日 02時00分

The Saros annual calendar owes its high efficiency to an innovative mechanism. Displaying the correct date all year long, this ingenious system developed by Rolex replicates the irregular occurrence of 30- and 31-day months. Only one adjustment is required – on 1 March, February having 28 or 29 days. The Saros mechanism consists of only four gear wheels and two gear ratios added to the traditional Rolex instantaneous date calendar. Such simplicity ensures a peerlessly robust and reliable calendar function.
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