ジラールペルゴのインスタグラム(girardperregaux) - 4月26日 01時08分

The Girard-Perregaux 1966 annual calendar and equation of time with ruthenium dial.
The annual calendar presenting the date and month automatically takes the length of the month into account, requiring only the occasional correction every 28th February of non-leap years. With its hand at 4.30, the equation of time indicates the difference between the real solar time and the mean or civil time. The length of a solar day actually varies daily due to the elliptical shape of the Earth's orbit. This astronomical complication is based on an ingenious mechanism incorporating an annual disc with an elliptical cam that reproduces the Earth's movement around the Sun. Taking technical sophistication even further, corrections to the calendar are made with the crown, in both directions. The system is simple to use and the absence of a corrector on the case leaves the purity of its harmonious curves intact.
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