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
Equation of time

Equation of time

Is a complication that illustrates the difference between mean solar time (average time) and true solar time based on the position of the sun. This difference occurs because the Earth's orbit around the sun is slightly elliptical, resulting in varying lengths of days throughout the year. Watches equipped with this function display the offset between mean time and solar time, allowing users to adjust their watches accordingly.