250 years ago... Foremost realisation in Horology !

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17th March 2026 will see the 250th anniversary of the passing of English horologist clockmaker John Harrison, the inventor of the Marine Chronometer crucial in the conquest for longitude !
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Timely upload of the 2000 movie "Longitude" in high resolution:

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More on this topic: #Longitude
 
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Looks like giggle You Tube pulled the video. Glad I watched it last week. I do have the DVDs. And most all the books. (takes quite a bit of shelf space.)

I remember the symposium back in the 1990s. Quite the show, and it pushed a lot of this into the mainstream.

At one time I was going to make my own copy of H4. There are beautiful drawings of it reprinted at one of the other anniversaries over the centuries. I did notice that the HD conversion made the prop watch look like it was printed out on a sheet of cardboard.

Used to be a whole bunch of enthusiast who did make copies of these clocks, I wonder if that is still a thing, or more lost institutional knowledge in this day and age of instant gratification.

My mentors who were into this stuff died about 25 years back when they were in their 80s and 90s. So I sort of lost interest. There just were not a lot of younger folk getting involved. Hopefully some of this will inspire another generation.
 
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Amazingly the "smart phone" generation has no idea how difficult it was to calculate longitude using the astronomical methods.
As a young officer I had the chance to look up old French Navy logs and learn about the Marine Chronometers (Horloge Marine by Ferdinand Berthoud) used on ships like "La Boussole" (1776), "Vautour" (1784), "l'Astrolabe" (1785) and "l'Espérance" (1791) to name a few...
As an amateur astronomer I learned both the lunar method and the Jupiter moons method, using tables was my thing... Anyway, great to see that the "Ferdinand Berthoud" name has been rebranded
 
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Amazingly the "smart phone" generation has no idea how difficult it was to calculate longitude using the astronomical methods.
That generation has a hard time doing fairly simple math without a calculator app.
 
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That generation has a hard time doing fairly simple math without a calculator app.
Watching one try to count change is something.