Perpetual Calendar - Patek Philippe CH 29-535 PS Q Manual Del Usuario

CHRONOGRAPH
The chronograph is started and stopped with the
pusher at 2 o'clock. The chronograph and minute-
counter hands are reset to zero with the pusher
at 4 o'clock.
TACHYMETER
Your watch has a tachymeter scale calibrated to
1000 meters . On a highway, a car passenger
would typically start the chronograph when pass-
ing a kilometer sign and stop it when passing the
next one. The chronograph hand shows the elapsed
time between the signs and, on the tachymeter
scale, the average speed of the car during the meas-
urement. It therefore measures the time needed to
travel a given distance rather than the distance
travelled within a given time.
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PERPETUAL CALENDAR

The perpetual calendar indicates the day of the week,
the date, and the month, automatically taking into
account months with 28, 29, 30, and 31 days. It
switches directly from September 30 to October 1
or from February 28 to March 1. In leap years, it
also displays February 29 and then jumps directly
to March 1 at midnight. In addition to the date,
day, and month, the watch also features a leap-year
display. The moon-phase display is highly accurate:
it deviates from the true lunar cycle by merely one
day every 122 years. If the watch is wound daily,
the perpetual calendar will not require any man-
ual corrections before February 28, 2100; this is a
secular year that by exception omits February 29.
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