Estação Cronográfica

quarta-feira, 30 de setembro de 2026

Os relógios IWC no Relógios & Canetas online

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Janela para o passado - Compan hias Reunidas Gás e Electricidade, Lisboa, 1913

Não há tempo para os fotões

Lido no Astrophilesz:

Here is one of the strangest truths in all of physics. For a particle of light, no time passes at all. The instant it is born and the instant it dies are, to the photon, the very same moment.

This falls straight out of Einstein's relativity. The faster something moves, the slower time flows for it relative to everything else. Push that idea all the way to its limit, to the speed of light itself, and time slows not just a lot, but completely. It stops. A photon traveling across the universe experiences its entire journey in zero time.

Think about what that means for starlight. A photon leaves a distant galaxy billions of light years away, crosses the vast emptiness of space, and finally lands in your eye tonight. From your perspective on Earth, that trip took billions of years. But from the photon's own point of view, there was no journey at all. Creation at the star and absorption in your retina happened in the same instant, with nothing in between. It was born and it arrived simultaneously.

In a sense, light never ages. It never experiences the distance it crosses or the eons it travels. The entire history of a photon, no matter how far it goes, is a single timeless flash.

There is a deep subtlety worth being honest about. Physicists point out that a photon does not truly have a valid perspective in the way we do, because the equations break down at exactly the speed of light. You cannot ride alongside a photon and look out. So this is best understood as the limit that relativity points toward, the idea our physics approaches, rather than a literal diary entry from light itself. But the underlying mathematics is rock solid, and the conclusion is genuinely mind bending.

It reframes something we see every single day. Every beam of sunlight warming your skin, every star in the night sky, is delivered by messengers for whom time does not exist. They arrive the same instant they leave.

Does it change how you see starlight, knowing the light reaching your eyes experienced no time at all on its way to you?

Meditações - Mesmo quando não uso relógio, é como se usasse

Uso relógio desde muito novo, de tal maneira que o meu punho esquerdo ficou moldado para sempre. Mesmo quando não uso relógio, é como se usasse. Muito raramente, num óptimo dia, perco a noção das horas. Quer dizer que estou mesmo de férias.

Afonso Reis Cabral, in jornal Sol de 18 de Agosto de 2026

terça-feira, 29 de setembro de 2026

Os relógios Hublot no Relógios & Canetas online

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Estamos por estes dias em MIlão, para a exposição Watch Art, da Patek Philippe

Janela para o passado - Loja das Águas, Lisboa, 1913

Time may be stranger than we imagine

Lido no Astrophilesz:

Time may be stranger than we imagine.

Recent quantum research has explored the possibility that, under certain conditions, information in quantum systems can behave in ways that blur our usual distinction between past and future. Some experiments and theoretical models even suggest that future measurements can appear to influence how we describe earlier quantum states.

That does not mean your future is rewriting your past.

There is currently no evidence that people can change history, erase past events, or send themselves messages through time. Cause and effect in our everyday world remain exactly as we experience them.

The real discovery lies much deeper.

At the quantum level, nature does not always obey the intuitive rules that govern our daily lives. Concepts like superposition, entanglement, and indefinite causal order suggest that time itself may not be as fundamental as we once believed.

Some physicists now propose that time could emerge from more basic laws of the universe rather than existing as a fixed cosmic river flowing from past to future.

These ideas are exciting, but they remain active areas of research, not established scientific fact.

Einstein showed that time is relative.

Quantum physics is now asking an even more profound question.

What if time is not the stage on which the universe unfolds, but something the universe creates as it evolves?

The biggest mystery may not be whether we can travel through time.

It may be understanding what time actually is.

Meditações - No tempo, vemos linha agulha e malha

Virgílio Castelo

segunda-feira, 28 de setembro de 2026

Indies NYC - relojoeiros independentes expõem em Nova Iorque

1776 Atelier — Texas, United States — Jason Lu & Zach Smith

Artur Akmaev — California, United States

Atelier Pieters — Les Hauts-Geneveys, Switzerland — Maarten & Jessica Pieters

Bradley Taylor — North Vancouver, Canada

Delaloye Genève — Geneva, Switzerland — Nicolas Delaloye

Dunselman Watchmaking — Zwolle, Netherlands — Annelinde Dunselman

Felipe Pikullik — Berlin, Germany

Garrick — Norfolk, England — David Brailsford & Simon Michlmayr

Holthinrichs Watches — Delft, Netherlands — Michiel Holthinrichs

Jean Khatchadourian — La Chaux-de-Fonds, Switzerland

Kallinich Claeys — Glashütte, Germany — Johannes Kallinich & Thibault Claeys

LEGARE — La Chaux-de-Fonds, Switzerland — Wei Koh & Guillaume Têtu

MANTEIO — Switzerland — Alex Goetschi

Marco Tedeschi — Gland, Switzerland

Marcu Genève — Geneva, Switzerland — Jérôme Marcu

Mermont — Sebastian Bey-Haut — Geneva, Switzerland

Reima Koivukoski — Helsinki, Finland

Sarpaneva — Helsinki, Finland — Stepan Sarpaneva

Statera Atelier — Maringá, Brazil — Rafael Guimarães & Antonio Almir dos Santos Neto

Stéphane Pierre — Annecy, France

Tan Zehua — Shenzhen, China

TAOS — Geneva, Switzerland — Olivier Gaud, Olivier & Dominique Vaucher

A.T. CREATION — France — Martin Tirello

VonKa & Berna — Sainte-Croix, Switzerland — Corentin Von Kaenel & Aaron Bernasconi

Zeitwinkel — Saint-Imier, Switzerland — Ivica Maksimovic, Peter Nikolaus, and Albert Edelmann

On the road, again...

Os relógios Hermès no Relógios & Canetas online

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Janela para o passado - Instituto Pasteur de Lisboa, 1913

Time is not the steady, universal thing we imagine

Lido no Astrophilesz

Time is not the steady, universal thing we imagine. It bends, stretches, and in the right conditions, breaks down entirely. And this is not science fiction. It is Einstein's relativity, tested and confirmed countless times.

Start with speed. The faster you move, the slower time passes for you compared to everyone else. This is called time dilation, and it is real enough that we correct for it every day. The GPS satellites guiding your phone move so fast, and sit so far from Earth's gravity, that their clocks tick at a slightly different rate than clocks on the ground. If engineers did not account for this relativistic shift, your navigation would drift off by kilometers within a day.

Gravity does the same thing. The stronger the gravitational field, the slower time flows. Near a massive object, time literally runs slower than it does far away. This means your head, being slightly farther from Earth's center than your feet, ages an almost impossibly tiny fraction faster over a lifetime. It sounds absurd, but it has been measured with atomic clocks placed at different heights.

Now push this to the extreme. Near a black hole, gravity becomes so intense that time slows dramatically. If you watched a friend fall toward the event horizon, the boundary of no return, you would see them appear to freeze, their motion stretching out slower and slower, their light fading, seemingly suspended forever at the edge. From their own perspective, though, they would fall right through in an instant.

And at the very center, the singularity, the mathematics of physics simply breaks. Gravity climbs toward infinity, spacetime curves without limit, and our equations stop giving sensible answers. In a very real sense, our current understanding of time ceases to apply there. It is one of the greatest unsolved frontiers in physics, the place where Einstein's relativity and quantum mechanics collide and neither fully works.

The takeaway is humbling. There is no single universal clock ticking for everyone. Your time is truly your own, shaped by how fast you move and how much gravity surrounds you.

Meditações - a vida é um intervalo

Virgílio Castelo

domingo, 27 de setembro de 2026

12ª Bienal do Património Relojoeiro

Grande Prémio de Relojoaria 2025 - Museu do Relógio de Serpa recebe o galardão

Ainda o Grande Prémio de Relojoaria 2025, organizado pelo Anuário Relógios & Canetas. Por motivos logísticos, depois de entregues os diplomas, só agora nos foi possível ir entregando os troféus. Neste caso, Eugénio Tavares d'Almeida recebe o referente ao Prémio Especial do Júri, que no ano passado distinguiu o Museu do Relógio, fundado pelo seu pai, António Tavares d'Almeida.

Os relógios Greubel Forsey no Relógios & Canetas online

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Janela para o passado - gasolina americana, Lisboa, 1913

O que é um zeptosegundo?

Do Facebook:

A zeptosecond is so absurdly small that comparing it to one second is like comparing one second to the age of the universe.

This is not just a tiny fraction of time.

It is a scale so extreme that it completely destroys human intuition.

In 2020, scientists at Goethe University Frankfurt measured a zeptosecond for the first time ever by observing how long it takes a photon of light to pass through a hydrogen molecule.

The result was 247 zeptoseconds.

That made it the shortest interval of time ever directly measured by humans — the fastest event ever captured in a laboratory.

To understand how small that is:

a zeptosecond is to a second what a second is to about 31.7 trillion years.

The universe is only 13.8 billion years old.

That means a single second contains more zeptoseconds than the age of the universe multiplied thousands of times.

And yet… this still may not be the true bottom of time.

Physicists think the smallest meaningful unit could be the Planck time — about 5.4 × 10⁻⁴⁴ seconds.

Below that scale, space and time may stop behaving like anything we understand.

Our current laws of physics simply break down.

So even though we can now measure light crossing a molecule… we are still nowhere near the deepest limit of reality.

We have learned how to watch time on scales almost too small to imagine. But the real question is:

If time itself has a smallest possible unit… then is reality truly continuous — or is the universe running on tiny indivisible frames?

Há 75 anos - morre Augusto de Vasconcelos, Presidente da Liga das Nações

Recordando Augusto de Vasconcelos, médico de formação, primeiro Ministro dos Negócios Estrangeiros da República, Primeiro-Ministro, Embaixador, Presidente da Liga das Nações. Faleceu a 27 de Setembro de 1951, há precisamente 75 anos. O artigo que escrevemos sobre ele para a revista dominical do Público, de 17 de Setembro de 1995. Quando Freitas do Amaral foi eleito Presidente da Assembleia Geral das Nações Unidas, a entidade que substituiu a Sociedade das Nações.