USER MANUALCOSMOS

INSTRUCTIONS FOR USE
ASTRONOMY AS A TIME MEASUREMENT INSTRUMENT
The measurement of time finds its origins in the observation of astronomical phenomena such as
the motions of celestial bodies in the sky. Most of the calendars have been developed according tothe movements of the Sun as Man observed a regular alternation of diurnal and nocturnal periodsof time. Thus, it is customary to measure a day according to the position of the Sun with respect
to the Earth.
A sidereal day and a solar day must be differentiated in terms of duration. A sidereal day lasts 23hours, 56 minutes and 4 seconds, which corresponds to a 360 degrees full rotation of the Earthon itself, independently of its revolution around the Sun. Meanwhile, a solar day has an average
duration of 24 hours corresponding with the time interval passing between two culminations of
the Sun on a given meridian. This positive difference of 3 minutes and 56 seconds is due to therevolution of the Earth around the Sun, leading to a rotation of more than 360 degrees of theformer.

A CELESTIAL GLOBE INDICATING THE CONSTELLATIONS OF THE ZODIAC
The celestial globe of Cosmos, whose mechanism is based on the duration of a sidereal day, is anastronomical globe indicating the constellations of the Zodiac. It is composed of 12 constellations
which showcase their very own combination of stars. Their arrangement recalls the astrologicalsigns known today and divided into 12 periods of time throughout the year.
The Zodiac differs between astronomy and astrology due to the phenomenon called “precessionof the equinoxes”. It corresponds to the gradual change of direction of the Earth rotation axis,resulting in a change of the stars position in the sky over the years. The astronomical calendarof the zodiac thus refers to the stars that are actually visible in the sky at a given time, unlike theastrological one that is invariant over time.
The current zodiacal constellation is the one that is placed behind the sun when it is 12 o’clock
solar time, referred to as “the sun passage through the constellation”. Invisible to the naked eye
because of the solar light diffusion in the atmosphere, the constellation is revealed by the celestial
globe of Cosmos.

Aries

PiscesTaurusAquarius

GeminiCapricorn

Sagittarius

CancerLeo

Scorpio
Virgo

Libra

ZODIAC CONSTELLATIONS SETTING TABLE

Aries

TaurusApril 19
May 13

GeminiCancerJune 22
July 20
May 14
June 21

Leo

Virgo

August 11
September 16
July 21
August 10

September 17
October 30

LibraScorpio

October 31
November 20
November 21
December 18

Sagittarius

Capricorn

December 19
January 20

Aquarius

PiscesFebruary 17
March 11January 21
February 16

March 12April 18

SETTING MECHANISM
The setting mechanism features an exclusive system developed by Girard-Perregaux’s R&Ddepartment. Instead of relying on a traditional crown on the case side, the setting system is basedon four rotating bows, called “bélières”, placed at the back of the timepiece.

TIME SETTING BÉLIÈRE

DAY/NIGHT
INDICATOR BÉLIÈREZODIAC CONSTELLATIONSINDICATOR BÉLIÈRE

WINDING BÉLIÈRE

Warning: The winding, the setting of the time, the day/night indicator and the zodiac constellations
indicator are unidirectional. To wind your watch and set the functions, pull the bélières up, make sureto turn them clockwise and push them down to their original position once the setting is finished.

TRIPLE FOLDING BUCKLE OPENING
In order to provide an easy access to the setting mechanism, the triple folding buckle is removable
thanks to an opening system. First, open the triple folding buckle by pressing on both push-buttons
number 1, then, open the security system by pressing on both push-buttons number 2.

1

1

2

2

Warning: After finishing the setting, make sure to secure the buckle again by replacing, fromabove, the unleashed part in its original position.

WINDING
The winding bélière is placed at the back of the watch at the bottom center.
Manual-winding:Your watch requires regular winding to work normally. To wind, pull the bélière up and turn itclockwise 11 times for a full winding. Once the watch is wound up, push the bélière down to its
original position.
When fully wound, your watch has a power reserve of minimum 57 hours.
Warning: Do not force the bélière once the resistance increases as this could damage themovement.

SETTING THE TIME
The time setting bélière is placed at the back of the watch at the top center.
Pull the bélière up and turn it clockwise. Once the time is set, push the bélière down to its originalposition.

SETTING THE DAY/NIGHT INDICATOR
The day/night indicator bélière is placed at the back of the watch on the left-hand side.
Pull the bélière up and turn it clockwise to align the mark “12” of the graduated ring with thelocation where it is 12 o’clock. The terrestrial globe acts as a day/night indicator as the day appearson the dial side and the night on the case-back. Once the day/night indicator is set, push the bélière
down to its original position.

SETTING THE ZODIAC CONSTELLATIONS INDICATOR
The Zodiac constellations setting bélière is placed at the back of the watch on the right-hand side.
Warning: Before making any setting, set the time at 12 o’clock. For a better accuracy, set thetime at 12 o’clock solar time as it coincides with the time when the Earth and the Sun are alignedwith the current constellation. To do so, convert the local time into the solar time by taking
into consideration your time zone, your location, the equation of time and the current season(summer/winter time).
Pull the bélière up and turn it clockwise until the current constellation is positioned at noon. Matchthe current date with the Zodiac constellations setting table on the previous pages and align theglobe with the middle of the constellation.
Once the zodiac constellations indicator is set, push the bélière down to its original position andadjust the time setting.

abecdFUNCTIONS
a | Hours		
b | Minutes
c | Day/night indicatord | Tourbillon
e | Zodiac constellations indicator

GIRARD-PERREGAUX GP09320
HAND-WOUND MECHANICAL MOVEMENT
Diameter:
37.85 mm (163/5’’’)Frequency:
21,600 Vib/h – (3 Hz)
Jewels:52
Power reserve:
minimum 57 hours
Functions: 	tourbillon, hours, minutes, day/night indicator, zodiac
constellations indicator

CASE
Diameter:
Crystal:Case-back:Water resistance:

47.00 mm
sapphire anti-reflective ‘box’
sapphire crystal
30 meters (3 ATM)

MDE-1025
www.girard-perregaux.com