Portuguese Sidérale Scafusia

Time is Relative

The Portuguese Sidérale Scafusia is the most exclusive and most complicated mechanical watch ever created by IWC Schaffhausen.

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A NEW STAR IN THE FIRMAMENT
OF LUXURY TIMEPIECES

The Portuguese Sidérale Scafusia is an apogee in the art of watchmaking from Schaffhausen. Never before, in the company history going back over 140 years, has an IWC watch featured such an array of astronomical displays combined with numerous complications and new advances in watchmaking.

The watch combines the romanticism of the star-studded night sky with rigorous scientific demands, complex watchmaking technology with astonishingly simple operation, and meticulous attention to detail with visionary far-sightedness. Viewed from the front, this fascinating masterpiece is a classic Portuguese, viewed from the back, it is an astronomical instrument. And on the inside, it is a technical milestone in the history of Haute Horlogerie.

It took the project team at IWC Schaffhausen ten years to develop and create the Portuguese Sidérale Scafusia. Watch specialists and astronomers combined their know-how and a wealth of experience in this ambitious project.

Portuguese
Sidérale Scafusia

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Apart from mean solar time – in other words, the normal time of day – the dial in the classic Portuguese style features three other highlights of mechanical watchmaking: a newly developed constant-force tourbillon, a display showing sidereal – or star – time, which is indispensable for astronomers, and a power reserve display showing 96 hours when the watch is fully wound.

Behind the sapphire-glass back we see the night sky studded with hundreds of stars, the detail and mathematical precision of which will quicken the pulse of any astronomer. Among other things, the watch displays the section of the sky visible from a precise location on Earth, together with the apparent orbit of the Sun in the course of the year, and the celestial equator. These are joined by complications such as the perpetual calendar and the absolute day of the year, together with sunrise and sunset as well as solar and sidereal time.

Every watch is unmistakably unique. Not only because the entire celestial chart is calculated individually but also – fully in keeping with IWC’s philosophy – because the customer can personally combine the components, whose selection can result in over 200 different design options of the watch itself.

In view of the enormous amount of work involved with each watch, production will be restricted to just a few pieces per year.

  • CONTACT IWC TO CUSTOMIZE YOUR PERSONAL PORTUGUESE SIDÉRALE SCAFUSIA

  • Contact IWC

Celestial Chart Customization

TAILORING THE NIGHT SKY TO OWNER’S SPECIFICATIONS

The Portuguese Sidérale Scafusia wristwatch has a night sky disc that reveals the full glory of the star-studded heavens. Realistically, it is possible to show around 500 to 1,000 stars on the glass, every single point representing a real, existing star. The meticulously plotted constellations make it easier to take one’s bearing. A precise location chosen by the customer provides the basis for the celestial chart and the astronomical displays.

The sky disc rotates in a clockwise or anticlockwise direction, depending on whether the chosen geographic location is in the northern or southern hemisphere. The horizon, identifiable as a yellow ellipse, shows the movements of the stars and the section of the sky currently visible in the real sky above the chosen coordinates. They may be indicated in terms of longitude and latitude, but also as GPS data or the name of a town or place.

The Astronomical Horizon
—We usually orient the horizon according to points on a compass; however, it is formally measured with respect to the spin axis of the Earth.
The Customized Horizon
—The night sky, currently visible from the geographical position requested by the customer, is shown within the yellow ellipse.

SUNRISE, TWILIGHT AND SUNSET

FOR THE MOST ROMANTIC TIMES OF THE DAY

SUNRISE

Sunrise is the precise time at which the upper edge of the Sun appears above the horizon. Sunrise times vary each day throughout the year due to the tilt of the Earth's rotational. It also depends on the longitude, latitude and elevation of your location. If you are located north of the Arctic Circle or south of the Antarctic Circle, there are days of the year when the Sun never rises and never sets.

On the rear of the Portuguese Sidérale Scafusia wristwatch, two red triangle hands on the outer 24-hour rings indicate sunrise and sunset. The times are calculated individually for a specific location.

TWILIGHT

Dawn is the time before sunrise when the sky is no longer completely dark. Likewise, dusk is the time after sunset when the sky is not yet completely dark. Twilight is the time between dawn and sunrise and between sunset and dusk.

SUNSET

The time at which the last part of the Sun disappears below the horizon is sunset. Sunset times vary each day throughout the year due to the tilt of the Earth's rotational. It also depends on the longitude, latitude and elevation of your location. If you are located north of the Arctic Circle or south of the Antarctic Circle, there are days of the year when the Sun never rises and never sets.

On the rear of the Portuguese Sidérale Scafusia wristwatch, two red triangle hands on the outer 24-hour rings indicate sunrise and sunset. The times are calculated individually for a specific location.

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THE CREATORS

EXPERTISE COMBINED TO CREATE A TECHNICAL MASTERPIECE

Learn More About the Creators

  • Trained as a watchmaker, qualified as a master craftsman, studied micro and precision engineering and obtained a postgraduate qualification in business management. During this time spent ten years as a watchmaker. Since 2002 developer and designer with IWC. Appointed Head of Research and Development R&D Movement in 2006, since May 2010 Technical Director, responsible among other things for the “Sidérale project”.

  • Trained as a watchmaker and then studied engineering in France, Germany and Switzerland. Executive MBA in Zurich. Project Manager and driving force behind the development of the 94900 calibre since 2005.

  • Graduated in mechanical engineering, Master of Science, worked as a design engineer with more than 50 registered patents. Subsequently a Project Manager in the automobile industry. Joined IWC in 2006, responsible for several product groups. For the past three years he has been Product Manager for the Portuguese Sidérale Scafusia wristwatch.

  • After school-leaving exams, he qualified as a watchmaker and master craftsman; with IWC since 1998. Works in the Specialities Department, assembling among other things the Grande Complication and the Minute Repeater. At IWC he will work on the Portuguese Sidérale Scafusia.

  • Graduated in engineering and microtechnology, followed by post-graduate degrees in business and quality management. With IWC from 1995 to 2005, latterly as Head of Development. Developed the concept of the Portuguese Sidérale Scafusia and designed the movement.

  • Came to the University of Zurich in 2002 to set up the Cosmology and Astrophysics research group. Specialises among other things in the origin, development and structure of the universe, dark matter and energy, and the formation of planetary systems. He advises the Portuguese Sidérale Scafusia team on all astronomy-related issues.

EXPLORE THE PORTUGUESE
SIDÉRALE SCAFUSIA FURTHER

The Portuguese Sidérale Scafusia is the first watch from IWC to feature a patented constant-force tourbillon together with many other complications and individually calculated astronomical displays. Every watch is made on special request and will be unmistakably unique.

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