Watchmaking The course

Creations · Astro

AstroThe sun on a ruler.

A clock inside a terrestrial globe that opens. Designed and made in 2014–2015 during the Brevet des Métiers d'Art, updated in 2019, shown at Baselworld in 2016: the first clock with a linear equation of time.

Click the globe to open or close it.

Equation du temps

What the dial tells

Three complications, one simple reading.

The equation of time

The sun does not cross the meridian at noon exactly: depending on the season it runs up to sixteen minutes ahead or fourteen behind. Astro shows it on a ruler from −15 to +15, with an index sliding in a slot — not with a hand.

The date

The small disc nearest the centre, its thirty-one days engraved in little circles, read by a steel hand.

Month, season, zodiac

The larger disc beside it carries three rings — the months, the seasons and the signs of the zodiac — and a single hand that goes round them once a year.

Astro clock with a linear equation of time, by Tristan Ledard

Baselworld 2016

From the Brevet des Métiers d'Art to the Basel fair.

Astro was designed and made at the Paris School of Watchmaking, then shown at Baselworld in 2016, the year of the AHCI Young Talent prize. The Model 1 is its direct heir.

See the Model 1 →

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