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Hi Folks,

Part 2 of the Back Plate Inscriptions is good to go! A deep dive on all things Saros and eclipses - do please enjoy :)

Cheers, 

Chris.


Direct links to the video -

Vimeo:  https://vimeo.com/755518861/23b56dad55

Youtube:  https://youtu.be/DlN-QFkDkvE


-------------- Video Notes: ---------------



References:


LUNAR ECLIPSES AND THE SAROS: https://eclipse.gsfc.nasa.gov/LEsaros/LEsaros.html

http://hist.science.online.fr/antikythera/DOCS/Bulletin%20SIS%20December%202005%20Counting.pdf - Counting Months and Years: The Upper Back Dial of the Antikythera Mechanism1 M.T. Wright 2005

https://www.jstor.org/stable/20191159  - "IG" XII, 1 913: An Astronomical Inscription from Hellenistic Rhodes - Alexander Jones 2006

https://www.sciamvs.org/files/SCIAMVS_07_003-041_Jones.pdf  The Keskintos Astronomical Inscription Text and Interpretations - Alexander Jones 2006

https://www.nature.com/articles/nature07130 - Calendars with Olympiad display and eclipse prediction on the Antikythera Mechanism - Freeth et al 2008

https://www.atnf.csiro.au/people/atzioumi/Antikythera2012/presentations/X-ray_Tomography-Ramsey.pdf X-ray Tomography of the Antikythera Mechanism - Andrew Ramsey 2012

https://link.springer.com/article/10.1007/s00407-014-0145-5  On the epoch of the Antikythera mechanism and its eclipse predictor - Carman & Evans 2014

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0103275  Eclipse Prediction on the Ancient Greek Astronomical Calculating Machine Known as the Antikythera Mechanism - Freeth 2014

https://journals.sagepub.com/doi/10.1177/0021828614537185 - The Antikythera Mechanism: the CONSTRUCTION of the METONIC POINTER and the back PLATE spirals - M. ANASTASIOU et al 2014

https://www.brepolsonline.net/doi/10.1484/J.ALMAGEST.5.110735 The Back Dial and Back Plate Inscriptions - Anastasiou et al 2016

https://www.brepolsonline.net/doi/10.1484/J.ALMAGEST.5.110736 - The Back Cover Inscription - Bitsakis/Jones 2016

http://www.jstor.org/stable/10.2972/hesperia.86.1.0129 The Calendar on the Antikythera Mechanism and the Corinthian Family of Calendars – Iversen 2017

https://doi.org/10.1057/s41599-018-0210-9 Revising the eclipse prediction scheme in the Antikythera mechanism - Freeth 2019

https://link.springer.com/article/10.1007%2Fs00407-019-00229-9 The Back Plate Inscription and eclipse scheme of the Antikythera Mechanism revisited - Iversen/Jones 2019

https://www.researchgate.net/publication/344329999_The_Antikythera_Mechanism_Rhodes_and_Epeiros  "The Antikythera Mechanism, Rhodes, and Epeiros" - Iverson, P 2020 

Lunisolar Calendar: https://en.wikipedia.org/wiki/Lunisolar_calendar

Intercalation: https://en.wikipedia.org/wiki/Intercalation_(timekeeping)

Intercalary Year: https://en.wikipedia.org/wiki/Leap_year

Metonic Cycle: https://en.wikipedia.org/wiki/Metonic_cycle

Callippic Cycle: https://en.wikipedia.org/wiki/Callippic_cycle

Variability of ancient Greek Calendars: https://en.wikipedia.org/wiki/Ancient_Greek_calendars

Plutarch, on the start of the lunar month: http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A2008.01.0063%3Achapter%3D25%3Asection%3D3

Hour: https://en.wikipedia.org/wiki/Hour


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The Antikythera Mechanism Episode 11 - Inscribing The Back Plate - Part 2

The Antikythera Mechanism Episode 11 - Inscribing The Back Plate - Part 2 Hi Folks, Part 2 of the Back Plate Inscriptions is good to go! A deep dive on all things Saros and eclipses - do please enjoy :) Cheers, Chris. ________________________________________________________ A very special thank you to Patrons: Sinking Valley Woodworks (http://www.sinkingvalleywoodworks.com) Glenn Trewitt Christopher Warnock Guy Loughridge Charles Frodsham & Co. Peter John Richardson Adam Slagle Thomas Veilleux Robin Haerens L'Enfant Watch Company C. A. Patrick Voigt Mark Coburn Bogdan Dan Steven R. Crider Gary Levario Pete Askew Jeff Armstrong Rudolph Bescherer Jr Robert Petz Ralph McCoy Jim Popwell Kaedenn Bradley Pirtle Alan Carey PaxAndromeda John A McCormick Thomas Eriksen Michael Hardel Tim Ball Dominik Rogala Xanadu-King Eric Witte Peter Grant Michener Jonathan Teegarden Steve Hossner ________________________________________________________ References: LUNAR ECLIPSES AND THE SAROS: https://eclipse.gsfc.nasa.gov/LEsaros/LEsaros.html http://hist.science.online.fr/antikythera/DOCS/Bulletin%20SIS%20December%202005%20Counting.pdf - Counting Months and Years: The Upper Back Dial of the Antikythera Mechanism1 M.T. Wright 2005 https://www.jstor.org/stable/20191159 - "IG" XII, 1 913: An Astronomical Inscription from Hellenistic Rhodes - Alexander Jones 2006 https://www.sciamvs.org/files/SCIAMVS_07_003-041_Jones.pdf The Keskintos Astronomical Inscription Text and Interpretations - Alexander Jones 2006 https://www.nature.com/articles/nature07130 - Calendars with Olympiad display and eclipse prediction on the Antikythera Mechanism - Freeth et al 2008 https://www.atnf.csiro.au/people/atzioumi/Antikythera2012/presentations/X-ray_Tomography-Ramsey.pdf X-ray Tomography of the Antikythera Mechanism - Andrew Ramsey 2012 https://link.springer.com/article/10.1007/s00407-014-0145-5 On the epoch of the Antikythera mechanism and its eclipse predictor - Carman & Evans 2014 https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0103275 Eclipse Prediction on the Ancient Greek Astronomical Calculating Machine Known as the Antikythera Mechanism - Freeth 2014 https://journals.sagepub.com/doi/10.1177/0021828614537185 - The Antikythera Mechanism: the CONSTRUCTION of the METONIC POINTER and the back PLATE spirals - M. ANASTASIOU et al 2014 https://www.brepolsonline.net/doi/10.1484/J.ALMAGEST.5.110735 The Back Dial and Back Plate Inscriptions - Anastasiou et al 2016 https://www.brepolsonline.net/doi/10.1484/J.ALMAGEST.5.110736 - The Back Cover Inscription - Bitsakis/Jones 2016 http://www.jstor.org/stable/10.2972/hesperia.86.1.0129 The Calendar on the Antikythera Mechanism and the Corinthian Family of Calendars – Iversen 2017 https://doi.org/10.1057/s41599-018-0210-9 Revising the eclipse prediction scheme in the Antikythera mechanism - Freeth 2019 https://link.springer.com/article/10.1007%2Fs00407-019-00229-9 The Back Plate Inscription and eclipse scheme of the Antikythera Mechanism revisited - Iversen/Jones 2019 https://www.researchgate.net/publication/344329999_The_Antikythera_Mechanism_Rhodes_and_Epeiros "The Antikythera Mechanism, Rhodes, and Epeiros" - Iverson, P 2020 Lunisolar Calendar: https://en.wikipedia.org/wiki/Lunisolar_calendar Intercalation: https://en.wikipedia.org/wiki/Intercalation_(timekeeping) Intercalary Year: https://en.wikipedia.org/wiki/Leap_year Metonic Cycle: https://en.wikipedia.org/wiki/Metonic_cycle Callippic Cycle: https://en.wikipedia.org/wiki/Callippic_cycle Variability of ancient Greek Calendars: https://en.wikipedia.org/wiki/Ancient_Greek_calendars Plutarch, on the start of the lunar month: http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A2008.01.0063%3Achapter%3D25%3Asection%3D3 Hour: https://en.wikipedia.org/wiki/Hour

Comments

Gregor Shapiro

Wonderfully delicate. Have these needles survived in Mediterranean salty water for 20 centuries?

Damien Miller

I wonder if the term "color" indicated whether a solar eclipse was total, annular or partial

clickspring

It appears to be something like that although still not quite clear, more detail in the research - Cheers :)

Damian Sutter

Stunning work! Checking my own Antikythera mechanism - if I'm reading those glyphs right - it clearly states that it's time to rewatch all previous episodes...

Jose Martinez

Fantastic work, as usual. I never tire of watching you work. It's enthralling. Thank you for all you do. I look forward to your next release. Stay safe, my friend.

Noah Orr

Beautiful work! The way the letters reference "footnotes" or comments in the margins is so cool to me. It makes me think this was a machine intended to be passed down from one operator to another, each one adding their own notes and maybe modifications to the mechanism. It's such a shame this one was lost at sea but it gives us a window into the past that would otherwise have been lost.

Jack DenHartog

Everything you and your ancient Greek counterpart have done is nothing short of incredible.

redruMKO

Amazing! - and interesting that 1 Saros period is almost exactly the age of majority for most of the world !? (18.03 yrs)

Justus Dehegovit

Chris, you have once again outdone yourself with this video. Do you intend to keep the back plate covered in india ink to preserve the unconfirmed glyphes? I would also like to learn more on the "full moon cycle" that was only briefly mentioned, as it was not entirely clear to me what infomation the cycle showed?

MrTridac

απίστευτα εντυπωσιακό SCNR. I used google translate for that, though.

Matt Walters

Absolutely incredible. Thanks for sharing this journey with us.

sztojanov

How can you engrave beutifully these inscriptions like this? I also have good hands, but I would definitely stumble a few times and scratching the surface. :-) Nice work!

Micheal Malsed

LOVE IT! Thank you for this - heck, you have to almost BE a computer to red that computer!

Cold War Motors

Thanks as always for sharing this journey with us. As someone who likes a project myself, I am humbled by your passion and patience. I am still awestruck by the magnitude of this achievement from 2000 years ago. Always looking forward to the next beautifully filmed and edited video.

clickspring

The text adds such a human quality to the machine, the language so clipped and dramatic.

clickspring

I'd like to keep it for a while to see whether it would have worked as a preferable way to present the instrument. It will be interesting to see how the the oxidation of the text affects contrast over time. Currently, it looks very readable and clear. If I was buying one, I'd definitely want the black dial!

clickspring

I often think about that. The userbase was evidently expected to have an unusually high level of literacy!

Duncan Luddite

Wonderful as usual Chris :) So, this goes public in a week or two? There's going to be a lot of very excited people then :D

Duncan Luddite

I liked your choice of engraving known text, and scribing deducted, though not conclusive, text.

Duncan Luddite

And the built in method of dividing up the prime number of months in a spiral .... brilliant. I'll stop posting now :)

clickspring

Thank you mate! Of all of the work so far, this one has been my favourite. It really felt quite surreal seeing the engraving IRL after all of these years seeing it only in 2d.

Kevin Reardon

Oh, my, god! It never crossed my mind to make one dial first and use it to calibrate the other. It was one of those forehead-smacking moments. I do know that such a method is one used by experts. I wonder if there is a Nobel Prize in this somehow. Thanks for the references. I have quite a lot of reading to just trail behind you.

Mike Brown

Chris, I've just arrived in Greece on holiday. I can check around and pick up a knock-off Antikythera Mechanism for you if you like. :^)

Dan Taber

Beautiful work, as always. Is the text on the original device reasonably certain to have been engraved? The potential labor-saving techniques discussed in the earlier videos made me wonder whether the maker might have used a set of letter punches instead. Would it have been feasible to make letter punches with the materials/technology available at the time? Is the writing on the device intact enough that the use of a punch would've been obvious?

clickspring

The text shows unmistakable evidence of an engraving tool. In particular the entry and exit marks of the tool, as well as the general characteristics of the cut itself. You can see the same sorts of marks in both this and the previous video where the heel of the tool drags slightly on entry, most visible at the apex of the vertices of letters like Mu and Sigma, but each letter shows the cutting tool action and direction in some way or other. One indication of the use of a punch would be to see some sort of character size/shape repetition, and there is no hint of this at all. The wreckage shows quite large variability in letter size & shape, with some strokes and letter features often differing quite dramatically even within the one line or glyph - Cheers :)

Steve Hossner

As always, your production value multiplies the workmanship. I am new to Clickspring, but I am captivated by this project and the also the art of your videography and presentation. Keep it up!

Ed Hulbert

Just sensational as usual! Been subbed on YouTube since 2016(?) and somehow you just keep upping the bar!! Like others have said, the moment where it clicked that you could use the one dial to calibrate the other, genuinely had me grinning. Might I ask what's next for the antikythera project? Big love from the UK

Sam Lander

Thank you. This is marvelous. Every Antikythera video reminds me of Allan Bromley in knee high dress socks and shorts, lecturing to me in 1988(?) about some (now forgotten) computer science thing. What I DO remember is that he'd would veer off to talking about this device with only the slightest excuse.

Duncan Luddite

Nice :) I would have liked to have met him. A couple of years ago I was able to purchase a tiny micrometer, that had belonged to Mr. Bromley, and measures 0.01mm. I use it regularly for the antiquarian watchmaking I do. He would have ben a fascinating gentleman. Thanks for the anecdote.

My Growth Rings

Chris, that repositioning of the pointer is an obvious answer to a question I’ve had since the start. This has really been interesting and mind expanding. Thanks for bringing us along. Scott