> Due to the precession of the equinoxes (as well as the stars' proper motions), the role of North Star has passed from one star to another in the remote past, and will pass in the remote future. In 3000 BC, the faint star Thuban in the constellation Draco was the North Star, aligning within 0.1° distance from the celestial pole, the closest of any of the visible pole stars.[8][9] However, at magnitude 3.67 (fourth magnitude) it is only one-fifth as bright as Polaris, and today it is invisible in light-polluted urban skies.
> During the 1st millennium BC, Beta Ursae Minoris (Kochab) was the bright star closest to the celestial pole, but it was never close enough to be taken as marking the pole, and the Greek navigator Pytheas in ca. 320 BC described the celestial pole as devoid of stars.[6][10] In the Roman era, the celestial pole was about equally distant between Polaris and Kochab.
The Earth's rotation around its axis, and revolution around the Sun, evolve over time due to gravitational interactions with other bodies in the Solar System. The variations are complex, but a few cycles are dominant."
Some ideas/questions: How is it painted? Is it laser cut or by hand? Did you designed it? How did you do the calculations? Does Saturn have rings? Where is the cutoff? (No Neptune/Uranus/Fobos/Deimos/...) Have you tried to give a different size to each planet?
PS: I showed the video to my older daughter that is interested in astronomy and she likes it.
Oh. That is very kind of you. I do have many more pictures and details. I will try to collect them together, and will publish it once it is done. But can’t promise that it will happen soon. So i will answer your questions here in the meantime.
> How is it painted?
The shapes are recessed and the recesses are filled with black nail polish. The excess nail polish was then scraped off from the flat upper surfaces leaving it only in the recesses.
It was very fiddly, and i don’t necessarily recommend this method for anyone. I have since learned how to enamel by melting glass powders onto the metal surface which is both easier and gives a better result. That is how i would do it today. (On my instagram the last reel i posted is showing that process, even though with a different design.)
> Is it laser cut or by hand?
A third and a fourth option. The planet side is machined on a cnc. First I etched the orbits with a v-bit, then cut the planets with a 0.8mm flat endmill, then cut the hole, and finally cut the outline. After that i etched the initials side chemically. As a resist i used self-adhesive vinyl which i cut with a plotter.
To be honest. I wouldn’t recommend this process either. It was super finicky, slow, and error prone. Today i would just etch and cut the metal with a fiber laser. In fact i bought a fiber laser because i got sick of the chemical etching and mechanical machining during this project. :)
> Did you designed it? How did you do the calculations?
I did design it! I’m very proud of it. The initials side was designed in inkscape while the planet side was generated with a python script. The script used the super handy skyfield python library for the calculations. (Which in turn uses the planetary ephemeris files published by the Jet Propulsion Laboratory.)
> Does Saturn have rings?
No ring of Saturn unfortunately. But it would be a cool idea!
> Where is the cutoff? (No Neptune/Uranus/Fobos/Deimos/...)
Unfortunately I don’t have a real good principled answer to this. Because of the machining I had a hard limit on the smallest details I could put on the metal. I did know that i wanted to put the Gallilean moons on there because their short periods meant that they provide good basis for the minutes and hours part of the date. I did know that i also wanted one of the gas giants to provide a “slow hand” to the clock to show the years, and to hopefully stretch out the period before the next time the solar system is in a similar position to very far into the future. And i wanted the inner planets and the Moon so people and future alien minds will recognise it as the solar system. Everything else was just futzing around with the script and finding a good compromise between not making it too large to wear and not making it too crowded either.
> Have you tried to give a different size to each planet?
I did, but it looked uneven and too haphazard to my eyes. Not saying it is impossible to make it neat with different planet sizes but I liked the diagram simplicity of keeping all the planets one size and the moons an other smaller size.
> I showed the video to my older daughter that is interested in astronomy and she likes it.
Oh thank you! That is lovely!
Permalink: https://www.instagram.com/cogs_and_curios/reel/DTNtEFPjEGQ/
> And i wanted the inner planets and the Moon so people and future alien minds will recognise it as the solar system.
I think it was successful.
Also there is an other skewiness. Because obviously the drawing is not to scale the moon position can be correct from the sun’s coordinate frame or the Earth’s coordinate frame, but not from both. I choose to make the moons “correct” in the sun’s coordinate frame. Meaning that if you were hovering over the ecliptic frame looking down at the Jupiter during the wedding and rotating the pendants so the sun is in the direction the real sun is, then you would see the moons under you in the same arangement as they are on the pendant. But if you would stand on the surface of earth (during the wedding) and look at Jupiter you would see the moons in a different arangements than a tiny human standing on the earth dot looking at the jupiter dot. (And not just because of the time delay difference, but because the coordinate systems are different.)
Which is weird. Because the wedding happened on Earth, not hovering over the plane of the eliptic over Jupiter. So maybe that was a weird choice. (And not even talking about how north-centric it is that i decided to draw the diagram from the “north” looking down at the eliptic, instead of from the “south” side. These are all kinda culturally driven arbitrary choices. Would love to have none of those present but I haven’t found a good and principeled way yet.)
They have a very handy example right on the landing page how one can calculate the positions and angles of a planet from a date.
The inverse was a bit trickier. But I also implemented a script which could “solve” a given picture backwards and give us a date. I believe i used binary search to narrow the date down first for the planet with the slowest period, and then refined the date around that timestamp using the position of the planet one faster. That way the estimate got more and more accurate and i didn’t need to brute force search a large time interval. (I applied the assumption that the date to be found is within half a saturn year from our current date, but if that assumption were incorrect it would have resulted in a solver failure during the refinement and thus detected.)
If you're in SF you should pay them a visit and buy a coffee at The Interval; I think you'll find it worth the trip.
Its nice to see that some people still care about creating such thoughtful art for modern constructions. It seems that most building of our time are just optimized for fast and efficient construction.
I hope there are many more out there, so that Earth's Graham Hancock of the year 16000 has something to explore on his/her ayahuasca trip.
Those buildings are, of course, gone now.
I am happy to answer any questions about this and if you want to see any of my other writing please take a look at: https://medium.com/@zander_longnow and https://www.rosefutures.com
https://www.epsilontheory.com/the-long-now/
Both are pretty obscure references for now, but I can easily imagine a world where they both become widely known in separate groups. Like the word "legacy" has hilariously different connotations for software engineers as compared to _everyone else_
Asking "How would you build a 10k year clock?" is one of my favorite ways to get to know people, say, at parties.
With a few seconds to mull it over, so far EVERYONE has had at least one strong, novel and leftfield idea that I had not heard or thought of before.
My favorites included: A mirror on the moon, bio-engineered crops and the Pyramids of Gizeh.
We will quite plausibly be known as the dam builder civilization, as these artifacts could very easily outlast the memory of what we call ourselves. It is fitting to embellish them in this way.
From the article itself, the Pyramids are only 12,000 years old. Every other Ancient Wonder has been destroyed.
Essentially there’s a Major Cataclysm about every 10,000 years, and a ‘Minor’ one about every 5000 years (Burkle Crater impact being the most recent).
How do you assume any parts of the Hoover Dam would be intact or even visible “hundreds of thousands of years from now”?
A 26,000-Year Astronomical Monument Hidden in Plain Sight - https://news.ycombinator.com/item?id=19124698 - Feb 2019 (57 comments)
Religion the category is only a few hundred years old. The things that fall under that category go back at least as far as Neanderthal times.
Casadio details it going back thousands of years across cultures.[2]
[1] https://plato.stanford.edu/entries/concept-religion/index.ht...
[2] https://api.pageplace.de/preview/DT0400.9780191045882_A29773...
the fact that _now_, we have independent traditions referred to by those terms, and so categorize the ancient practices under "religion" is quite confusing, and it may be productive to make the distinction clear.
for a modern example, suppose we build a skyscraper in such a way that it lines up with, or reflects the setting sun on the solstice. we would regard this as "architecture", not "religion". i would be quite offended if, some thousand years from now, the aesthetic decision is dismissed as primitive superstition.
Why? I can't imagine being offended if people today, ignorant of the true motivations, dismissed it as primitive superstition, let alone a thousand years from now when I'm long dead.
did the use of the word "offended" trigger this comment? fine, then i would not take offense. my point is this:
i prefer to be remembered by a future that feels it can learn something from the past. it would be sad to me to find out that the people of tomorrow do not regard my contributions.
> The concept of "religion" was formed in the 16th and 17th centuries. Sacred texts like the Bible, the Quran, and others did not have a word or even a concept of religion in the original languages and neither did the people or the cultures in which these sacred texts were written
That said, GrowingSideways is mistaken. He is confusing the thing with the category of the thing.
IMO this and the sources it cites are wrong. A huge chunk of the Old Testament is about how God had to keep sending prophets to tell the Israelites to stop worshipping other deities. So while they may not have had a single word that was equivalent to 'religion,' they clearly possessed the same concept. They would just use the phrase "worshipping other gods."
There are many texts written in the Greek or Roman antiquity that compare the religions of various nations known to them, i.e. which compare their beliefs about their "gods" and their methods for worshiping or for praying.
There are entire books written about such subjects, e.g. "De natura deorum" ("The nature of gods") by Cicero.
The ancient people usually did not have a precise word with the definite meaning that "religion" has today, mainly because religious practices were intermingled with most of their daily activities, so there was not a very clear separation between religion and other things.
For example, a treatise on agriculture, besides explaining how to prepare the soil and how to select the seeds for sowing, would also give the text of a prayer that should address a certain god before or after the sowing, so that it will be successful. Similarly for any other activities where divine help was believed to be necessary.
Nevertheless, they had the concept of religion and they were able to distinguish things that were related to gods from unrelated things.
I’m so intrigued - what was going on inside Hansen's brain?
Victory/elation/worship corresponds to extending the arms above the head or in a "V" shape, sorrow/grief corresponds to dropping to the knees and holding the head in the hands, etc. These associations seem to persist despite language barriers and great spans of time.
Walking along the millennia, viewing the night's glorious celestial panorama, the registrations on the floor, you'll have successfully circumnavigated the long now, as well the total integral of your own life.
Hopefully, we'll have alternate means of power generation that nullify the dam's economic viability long before then but water supply and flood mitigation are other functions that need consideration. Silt will eventually destroy those functions as well however.
""" I walked across the marble star map that traces a sidereal revolution of the equinox and fixes forever, the Reclamation man had told me, for all time and for all people who can read the stars, the date the dam was dedicated. The star map was, he had said, for when we were all gone and the dam was left. I had not though much of it when he said it, but I thought of it then, with the wind whining and the sun dropping behind a mesa with the finality of a sunset in space. Of course that was the image I had seen always, seen it without quite realizing what I saw, a dynamo finally free of man, splendid at last in its absolute isolation, transmitting power and releasing water to a world where no one is.
"""
Our written history already goes back over 6,000 years. We can actually understand what people back then wrote. We don’t need unbroken year numbering, or leading zeros, to understand that. The calendar has been reset and changed multiple times. It seems like a mis-focus on something that doesn’t really matter.
Nonsense formatting.
I wonder if some content creator 12K years from now will transport to Earth and stream the North Star from this position for likes/views. If that's even a thing then...
They’ll almost certainly still be on Earth. Fundamental physics is unlikely to change in the next 12,000 years.
Only in the northern hemisphere.
The statues in OP's article are absolutely beautiful examples of Art Deco / 1930s Americana (my local post office was built then, too, and has eaglettes of similar [but smaller] design). I had no idea they were out there until stumbling upon them, and they definitely leave a lasting impression of our forefather's imposing presence. America, fuck yeah!
Wish I had then-known about this "clock," which is definitely hidden in plain sight. Wish we had similarly-lavish federal budgets, today. But worth visiting, both article, statues & dam.
Definitely a cool experience, and I'm glad I did. My last year attending DEF CON me and a Hadoop buddy (nobodies) just walked up onto a stage [during a terrible presentation] and started drinking whiskey with the ESL speaker (again: nobodies) — predicting we'd get banned from attending (but didn't — nobody cared... audience appreciated the break from hard-to-understandings).
The stars themselves will move - relative to us - and eventually some of them will disappear but nothing much is expected on that front for much longer than 10ky timeframes.
Kinda sus of this.
Dams are not permanent structures without maintenance. If they are holding back water or if water is flowing through them, they will eventually erode and their foundations will collapse.
Because the main structure lacks rebar , it will last longer than most modern structures, but it won't last nearly as long as 2,000-year-old Roman structures made with volcanic ash and lime because it uses Portland cement.
There is bigger and more immediate problem. Hoover Dam ends with siltation long before concrete erodes. The Colorado River carries massive amounts of sediment. Eventually, the lake behind the dam will fill with mud, turning the dam into a giant waterfall. Once water starts flowing over the top of a arch-gravity dam rather than through controlled pipes, scouring at the base will undermine the foundation.
Is sarcasm, but it may as well not be since that America is long dead and gone and has been replaced by an America that really needs to be renamed at this point.
Also - wouldn't the north star(s) (polaris, deneb etc) also move, even if slightly, in that period of time as well ?
plein d’impressement: a series of cordialities
a.k.a. cuckoo clock
Why do you mind what others do?
> A leading zero does not unambiguously say "there are no implied nonzero digits to the left of this zero".
Nor does it anywhere say that it means that or that it should mean that. To me the the leading zero in front of 1931 means “Do you think a thousand year is long? Think on a longer scale.” It is a vibe.
> Or is that the usual truncation of 101931, since most relevant dates are in this decamillennium?
The sentients of 101931 won’t be confused because they will know that 01931 refers to our time. Simply from all the context clues acrued. Such as the fact that the document was written in HTML (an archaic markup format rarely used past 8470 as any historicaly inclined sentient of that age would know) and found saved on an SD—card in the backpack of an astronaut who crash landed on the far side of the moon in 2457. Same as you don’t get confused about which milenia a roman public inscription unearthed in Pompei refers to.
They may well be confused, because by then this silly "long now" stuff will be long since forgotten.
Either a future archeologist has sufficient context to localize the writing to within plus or minus 5k years or the situation was hopeless to begin with. In all likelihood the latin script itself will be sufficient. In the unlikely event that latin numerals remain in near continuous use for another 100k years the writing system alone would then prove insufficient but hopefully you see my point.
That said, it seems the latin alphabet has been in use for 2700 years and is used by approximately 70% of the global population at this point so I guess if any alphabet is going to survive that far into the future it's one of the top contenders. But even then the scripts and usage conventions have changed drastically since its advent. Do we really expect anyone to be employing anything that even vaguely resembles a present day font face that far into the future?
It's has been pretty normal for clocks with digital displays to include leading zeros for seconds, minutes, hours and/or days for about a century. Doing the same for years, while unusual, doesn't seem particularly confusing. And of course, there is precedent with things like ISO86011 - where 0400 is the year 400 CE.
I'm not sure why one would assume it was a truncation of 101931. That doesn't really make much sense. The first decamillennium digit started at 0, just like the first millennium digit started at 0. 101931 would be 99,905 years in the future.
> how people say 03 when they mean 2003
Making people think beyond that form of casual shorthand (even omitting the apostrophe which would indicate the omission!) is sort of the point? Never mind that 03 doesn't necessarily mean 2003.
How about this: 1931 is a complete decimal integer requiring no further adornment.
For the same reason one assumes that 03 refers to 2003 rather than 1903 (or 1803, or ...).
Of course, it's the surrounding historical context that resolves such confusion.
If so that is somewhat ironic. A message intended to communicate a date to thousands of years into the future got demolished a mere 86 years after its creation due to a drainage issue and a contract dispute.