Girard-Perregaux Watch Manual De Usuario página 40

Date and month
Warning: before making any correction, ensure that the time display is between 9:30 AM and
8:30 PM. Outside this range, any rotation of the stem in position 1) will have no effect. Use
midnight as a reference for the date and day change to ensure you are positioned at the right
time of day.
A. Pull out the crown of your watch into the date setting position, in position 1).
B.
Turn the crown until the day hand a) indicates the desired date. The crown can be turned in
both directions. The month disc b) is synchronized with the date hand, so it does not need
to be changed.
c. On the desired date, push the crown back against the case, in position 0); the watch will
restart immediately.
Warning: After making any setting, always return the crown to its original position against the
case, position 0), to preserve the water resistance of your watch and prevent any damage to the
mechanism. To do so, refer to the chapter "Crown."
N.B.: For months with 30 days, the date takes approximately 4 hours 30 minutes to jump to the
first day of the next month, passing through the 31
7 hours 30 minutes to jump to the March 1
A B
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. For February, the date take approximately
st
st , passing through the 30 th and 31 st .
c
English
Equation of time
Introduction
The Earth's orbit around the sun is not perfectly circular. As with most of the celestial bodies in
our solar system, its trajectory is elliptical. In addition, the Earth's axis is tilted in relation to the
orbit's plane.
A consequence of this irregular trajectory is that the length of the solar day – the interval between
the times at which the sun twice passes the meridian at a given location – varies according to the
season. The 24-hour day used for civil time is calculated using the average duration of the solar day.
Reading
The equation of time function indicates the difference between the mean time and the solar time.
This difference is indicated by a little hand which moves along a graduated arc. It can extend
to between approximately +14 and -16 minutes for certain dates at the start of February and
November respectively.
Setting
The equation of time indicator is synchronized with the calendar readings, and therefore does
not require adjustment.
Beginning February Beginning November
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