Audemars Piguet Royal Oak Chronograph in stainless steel with blue dial

Focus On Materials: Primer On The Science of Steel, The Stuff Of Cases, Mainsprings, Hairsprings, Pinions, Escapements And The Backbone Of Watchmaking – Reprise

Joshua Munchow talks about steel here, the metal that made the world! Watch cases and other movement components are commonly made from certain stainless steels, 304 and 316L being the most frequent. It also happens that some brands hold exclusive rights to use specific alloys in the production of its watches. Here’s what you should know about steel.

Aurora Borealis seen in Germany, note how bright the scenery looks for a dark night

The How, What, When, Where And Why Of Seeing The Aurora Borealis, AKA Northern Lights – Reprise

Ian Skellern and his wife serendipitously chanced upon “seeing” the aurora borealis while visiting Jackson Hole, Wyoming, and the excitement of that led to months of research. And that research led to spending a few days in the Arctic Circle in the north of Sweden. Here is what Ian has learned about the northern lights so far, some of it firsthand.

All gold on earth came from outer space

All Gold On Earth Came From A Big Bang (Not That One) In Outer Space – Reprise

The most common choice for classic dress watches has to be gold, but have you ever wondered where that gold originally came from? And by “originally” Ian Skellern isn’t referring to a gold mine on earth but the original source of the gold before it even arrived on our planet. Spoiler alert: it involves an explosion, a very big explosion!

El Castillo at Chichen Itza

The World’s Biggest Man-Made Calendar: El Castillo At Chichén Itzá – Reprise

Contemplating the 30-meter-high ancient pyramid at Mayan archaeological site Chichén Itzá in the blazing Yucatán sunlight, Elizabeth Doerr was awestruck by the structure’s complexity. Not just because of the pure historical ramifications of the pyramid and temple known as El Castillo, but also because of its timekeeping capabilities. Yes, you read that right: timekeeping capabilities!

All gold on earth came from outer space

All Gold On Earth Came From A Big Bang (Not That One) In Outer Space – Reprise

The most common choice for classic dress watches has to be gold, but have you ever wondered where that gold originally came from? And by “originally” Ian Skellern isn’t referring to a gold mine on earth but the original source of the gold before it even arrived on our planet. Spoiler alert: it involves an explosion, a very big explosion!

Breguet Marine Equation of Time Marchante Ref. 5887

Equation Of Time: What Is It And What’s The Attraction In A Watch?

In its simplest form, the equation of time is defined as the difference between the time displayed by the position of the sun (as by a sundial) and the time displayed by any modern clock or watch. But that’s just the beginning, and watchmaker Ashton Tracy explains more.

Panerai Jupiterium planetarium with terrestrial perpetual calendar in the base

Out-Of-This-World Jupiterium: Panerai’s Tribute To Galileo Galilei, A Geocentric Planetarium Perpetual Calendar

Given Panerai’s origins in Florence, it should come as no surprise that the Italian watchmaker created a horological tribute to the insatiably curious father of modern science Galileo Galilei, who was once a resident of the Renaissance city. The Jupiterium is a one-of-a-kind geocentric planetarium with perpetual calendar.

Christiaan Van Der Klaauw Real Moon Tides in red gold

Ebb And Flow: Christiaan Van Der Klaauw Real Moon Tides

In the Real Moon Tides, Christiaan van der Klaauw’s watchmakers incorporated an indication of the phenomenon that is the most real-world expression of the moon’s effects towards life on earth: tides. The most incredible aspect of tides is how variable they actually are when you really get into the nitty-gritty details. And this watch reflects them in a beautiful way.

Jaeger-LeCoultre Duometre Spherotourbillon Moon

Precession Obsession: Jaeger-LeCoultre Duomètre Sphérotourbillon Moon

While we see Polaris as the North Star for now, our descendents 20 generations down the road from now will not. This is due to an astronomical process called precession. There is something that mimics precession that you can wear on your wrist and pass on to those descendents: the Jaeger-LeCoultre Duomètre Sphérotourbillon Moon, the most recent addition to Jaeger-LeCoultre’s already stacked Duomètre collection.

The intricately engraved case of the Pomander Watch

Is This The World’s Oldest Known Watch? A Peter Henlein Mystery From 1505

It’s a story that could have come out of a thriller novel, and it’s about the oldest known watch in the world, which was made in 1505 by Peter Henlein. The Pomander Watch (‘Bisamapfeluhr’), as it is known, was confirmed by committee of experts as having been the work of Peter Henlein in 1505.