Brilliant Starry Sky Commentary On Portugal Sidérale Scafusia Watch

The Mid-Autumn Festival is coming once a year. The family always gather together to spend the Mid-Autumn Festival and enjoy the moon together. While watching the moon, we can also see the sky full of stars. I don’t know which bright star to focus on. If you do n’t want to look up at the starry sky, start with a starry sky watch. The Mid-Autumn Festival is really looking up at the moon and looking down at the stars. Today’s watch home brings you a brief review of the Portuguese Sidérale Scafusia watch, the official model is: IW5041.

 The Portuguese Sidérale Scafusia watch is the most unique and complex mechanical watch ever made by IWC. In addition to the dial design seen on the front, the star map on the back is the biggest feature of this watch. Some people may not know how to look at the starry sky watch. Today’s watch home will take everyone to study this starry sky watch.

 The Portuguese Sidérale Scafusia watch can provide two different methods of side-by-side timing. The time displayed on the front of the watch is the average solar time, which is our daily time. We can also know that the small second hand of the watch is set at 9 o’clock. Bit of a spherical tourbillon device. Let’s take a closer look at the front dial of the watch with the Watch House.

 The small dial set at ’12 o’clock’ shows the 24-hour stellar hour (star hour), which is the timing system adopted by astronomers. The time shown here is 8: 3 am. The year-round error between the stellar hour display and the actual star time is only 11.5 seconds.

 Constant power tourbillon and small seconds, the new combination of tourbillon and constant power device, to ensure accurate and average speed of at least 48 hours. In constant power mode, the small second hand moves once every second. After that, the power shifts to normal mode, speeding up to a beat every fifth second.

The watch has a power reserve display at 4 to 5 o’clock on the front face of the watch. It is fully wound and the watch can provide a 96-hour power reserve.

 After reading the front, then look at the back. What secrets are hidden on the bottom of this watch? This is the beautiful and mysterious starry sky chart. What is the use of the starry sky chart? What do you think? This is the question of most people, and now Watch House will use this watch to explain the specific role of this star map in detail.

 The first is the whole of the star map. This whole shows the night sky stars that can be viewed at a specific point on the earth. This point can be calculated independently according to customer requirements, so the starry sky map displayed at different points is also different.

 The horizon and geographic coordinates, the night sky view that can be viewed from the geographic coordinates (yellow coordinates) specified by the customer, will be displayed in the yellow oval (see the previous full picture).

 This is a two-day counter (sequential date) that displays the number of days in a year and sets the leap year display. The picture shows the 188th day of a leap year, which is July 8, 2012.

 The red arrow with dots indicates the average solar time on a 24-hour circle. Read time from the outer circle. Solar time refers to the time required for the sun to cross the same meridian twice.

 A yellow arrow with a star symbol indicates star time on a 24-hour circle. Read the time from the inner circle in the same way. Stellar hour refers to the time required for a star to cross the same meridian twice.

 Sunrise and sunset times. When running at standard time, two red triangle hands mark the sunrise and sunset times on the 24-hour outer circle. One hour is added during daylight saving time (DST + 1) operation.

Zodiacal, red circle shows the obvious orbit of the sun on the celestial sphere throughout the year.

 Celestial equator, gray dotted circle indicates celestial equator. It is the projection of the Earth’s equator on the celestial sphere and forms a circular plane separating the northern and southern hemispheres. The following watch home will explain the difference between the day, night and twilight display of the astrolabe.

 Sunset is the time when the last part of the sun disappears from the horizon. Since the inclination of the Earth’s rotation varies from day to day, sunset times vary throughout the year. It also depends on the longitude, latitude, and elevation of the selected location. If you are in the northern part of the Arctic Circle or in the southern part of the Antarctic Circle, you will not be able to see sunrise and sunset at all days of the year.

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

 Sunset is the time when the last part of the sun disappears from the horizon. Since the inclination of the Earth’s rotation varies from day to day, sunset times vary throughout the year. It also depends on the longitude, latitude, and elevation of the selected location. If you are in the northern part of the Arctic Circle or in the southern part of the Antarctic Circle, you will not be able to see sunrise and sunset at all days of the year.

 The watch is equipped with the 94900 manual winding movement independently developed by IWC, which consists of more than 500 independent parts. Among them, the basic movement and the astronomical module are combined. The ever-changing tourbillon with constant power, allowing viewers to explore the fine structure of the balance device. The tourbillon’s frame and upper half are made of titanium. The rhodium-plated escape wheel and nickel-silver stop splint are chamfered by hand.

To sum up: Although we are not literati saints, we also like to look up at the sky, from the stars’ ever-ending flashes, looking for the secret of time. The watch uses a variety of case materials, five different dial colors, various applique scales and strap colors, and strap materials, with more than 200 different designs to choose from. Due to the complexity of the watch, production is extremely limited.

Please click on watch details: iwc / 21440 /

Updated: 3. January 2021 — 21:16
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