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INSTRUCTION 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 to 
the movements of the Sun as Man observed a regular alternation of diurnal and nocturnal periods 
of 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 23 
hours, 56 minutes and 4 seconds, which corresponds to a 360 degrees full rotation of the Earth 
on 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 the 
revolution of the Earth around the Sun, leading to a rotation of more than 360 degrees of the 
former.

Summary of Contents for COSMOS

Page 1: ...USER MANUAL COSMOS ...

Page 2: ...sition 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 23 hours 56 minutes and 4 seconds which corresponds to a 360 degrees full rotation of the Earth on 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 betw...

Page 3: ...inoxes 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 calendar of the zodiac thus refers to the stars that are actually visible in the sky at a given time unlike the astrological one that is invariant over time The current zodiacal constellation is the one that is placed behind the ...

Page 4: ...ZODIAC CONSTELLATIONS SETTING TABLE April 19 May 13 May 14 June 21 July 21 August 10 September 17 October 30 June 22 July 20 August 11 September 16 Taurus Aries Virgo Leo Cancer Gemini ...

Page 5: ...November 21 December 18 January 21 February 16 March 12 April 18 October 31 November 20 December 19 January 20 February 17 March 11 Pisces Aquarius Capricorn Sagittarius Scorpio Libra ...

Page 6: ...es placed at the back of the timepiece 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 sure to turn them clockwise and push them down to their original position once the setting is finished TIME SETTING BÉLIÈRE WINDING BÉLIÈRE ZODIAC CONSTELLATIONS INDIC...

Page 7: ...e 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 Warning After finishing the setting make sure to secure the buckle again by replacing from above the unleashed part in its original position 1 1 2 2 ...

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Page 9: ...movement 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 original position 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...

Page 10: ...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 Match the current date with the Zodiac constellations setting table on the previous pages and align the globe with th...

Page 11: ...e minimum 57 hours Functions tourbillon hours minutes day night indicator zodiac constellations indicator CASE Diameter 47 00 mm Crystal sapphire anti reflective box Case back sapphire crystal Water resistance 30 meters 3 ATM FUNCTIONS a Hours b Minutes c Day night indicator d Tourbillon e Zodiac constellations indicator a b c d e ...

Page 12: ...MDE 1025 Place Girardet 1 2301 La Chaux de Fonds Suisse T 41 32 911 33 33 F 41 32 913 04 80 www girard perregaux com ...

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