To guarantee the precision of the sidereal time display on the DBS, Arnold & Son created a completely new movement with a double barrel/gear train and double balance/escapement running at different speeds that enables the watch to display mean solar time and mean sidereal time simultaneously.
The DBS Equation Sidereal features three subdials on its silvery-white and opaline dial. Sidereal time is displayed on the left subdial and mean solar time on the right. A subdial at 12 o’clock indicates the equation of both times on a 24-hour basis, showing the difference between mean solar time and sidereal time. The long central running seconds hand is for the solar time. The two barrels are wound using the crown on the right, but each time display is set separately using the crowns on the left and right so that neither of the displays is changed by accident.
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