Calender timepiece comprising an equation-of-time device

摘要

The timepiece has hour and minute hands (10, 12) indicating civil time, and hour and minute hands (14, 16) indicating true minute. The daily position of the hand (16) is determined by the position of an equation of time cam. A longitude correction mechanism permits to drive the hand (16) forward or backward for a maximum value of +- 30 minutes by temporarily uncoupling it from a clockwork movement.