The Excalibur Bi-Retrograde Calendar by Roger Dubuis

This year, Roger Dubuis celebrates its 30th anniversary, and for the occasion, the company pays tribute to its co-founder’s favourite complication: the bi-retrograde display.

This function, previously featured in the Excalibur Grande Complication alongside a dozen other highly complex mechanisms, takes centre stage once again. The Maison has also introduced a less complicated, more classic edition to further honour the bi-retrograde display.

Also referred to as “the ecliptic counters” by the Maison a nod to their elliptical shape and distinctive role in indicating the months and date the design showcases a symmetrical dial layout. Enhanced by refined detailing, it pays homage to the Maison’s early creations from 1996.

Glossary

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Glossary
Longitude

Longitude

Longitude is the angular distance of a specific location on Earth, measured east or west from the Prime Meridian. The Prime Meridian, located at 0 degrees longitude, serves as a reference point from which longitude lines are measured. Longitude lines extend from 180 degrees west to 180 degrees east, forming a complete circle around the Earth.

Longitude plays a crucial role in determining the location between east and west and is used in conjunction with latitude to create accurate geographic coordinates. Measuring longitude is essential for navigation, timekeeping, and precise location determination on maps and Global Positioning Systems (GPS).

Longitude lines also play a significant role in certain watch features that rely on geographic data, such as world time complications or sunrise/sunset indicators.