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Posted by mkmk 1/20/2026

A 26,000-year astronomical monument hidden in plain sight (2019)(longnow.org)
565 points | 113 commentspage 2
rosefutures 1/22/2026|
Thanks for your interest in this piece, I am happy to hear that the restoration of this work has been completed! aaronstreet over at https://www.oskarjwhansen.org has been doing great work in documenting Hansen's work and Im sure will have an update on that soon.

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

MomsAVoxell 7 days ago||
I visited it the first time as a teenager in 1986 part-way through a driving tour from LA to Mexicali and Vegas and Tahoe and so on.

I had a Sony Walkman and one of the 'trip tapes' I'd had packed for my family driving-tour vacation, was Eddy Jobson, Theme of Secrets. So his visceral strings and landscape arrangements were my personal soundtrack all the way to those crazy angel sculptures and beyond, to Death Valley and Vegas and all that jazz, until we got back to San Francisco, where I'd got his tape.

The eternal nature of that spot really seemed feasible to me. Even if the water dried up completely, it'd still be somewhere, some time in the future, some people would meet .. and perhaps wonder just what it was all about, some tens of thousands of years ago.

dang 1/21/2026||
Discussed at the time (of the article):

A 26,000-Year Astronomical Monument Hidden in Plain Sight - https://news.ycombinator.com/item?id=19124698 - Feb 2019 (57 comments)

aebtebeten 1/20/2026||
For a hypothesis concerning the precession of the equinoxes and religious pantheons, see https://news.ycombinator.com/item?id=38761574
GrowingSideways 1/20/2026|
[flagged]
tzs 1/20/2026|||
You are confusing the thing with the category of the thing.

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.

Aloisius 1/20/2026|||
The conceptualization of religion as a category, is actually quite a bit older. The idea that it was created recently was, well, created recently.[1]

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...

testaccount28 1/20/2026||||
it's an interesting point, and i don't think it can be resolved quite so neatly. to the people building such monuments, or writing such texts, the activity may have been closer to what we now refer to as "history" or "natural philosophy" (or even "civic infrastructure").

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.

Aloisius 1/20/2026||
> 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.

testaccount28 1/21/2026||
look on my works, ye mighty, and dismiss them as mere superstition.

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.

maebert 1/20/2026||||
cf. "The Map is not the Territory"
GrowingSideways 1/22/2026|||
[dead]
MarcelOlsz 1/20/2026|||
What?
tzs 1/20/2026|||
Wikipedia says similar [1]:

> 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.

[1] https://en.wikipedia.org/wiki/History_of_religion

toasterlovin 1/20/2026||
> or even a concept of religion in the original languages

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."

adrian_b 1/20/2026||
Indeed.

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.

GrowingSideways 1/20/2026|||
[dead]
akshay326 1/20/2026||
> There is an angle for doubt, for sorrow, for hate, for joy, for contemplation, and for devotion.

I’m so intrigued - what was going on inside Hansen's brain?

Liquix 1/20/2026|
Makes sense when talking about human postures and emotions.

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.

myrdynEmbrys 1/20/2026||
You solved the riddle good sir!

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.

peter303 1/20/2026||
The precession circle is 144 arc degrees sin 23.5. In an 80 year lifespan precession would move the rotation pole about .44 arc degrees or the diameter of the full moon. Any long lived astronomical observatory in ancient times would have noticed this.
DougN7 1/20/2026||
That was an excellent rabbit hole to go down while eating lunch :)
staplung 1/21/2026||
I think the most likely end fate of the Hoover dam is that humans dismantle it. Eventually, Lake Mead will silt up enough to make the hydro plant useless (it will take centuries to silt up completely but silt will choke the plant long before that). De-silting the reservoir is not a realistic option.

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.

ifh-hn 1/20/2026||
I first heard about this in a Graham Hancock book. Found it a fascinating example of an attempt to encode a date that far distant future generations might understand (provided it survives).
spartanatreyu 1/21/2026|
Graham Hancock the fraud?
ifh-hn 1/21/2026||
I think author and journalist is how he presents himself. Or pseudo-scientist according to Wikipedia. But yes Graham Hancock.
carlcortright 1/20/2026|
And to think we're all here building b2b SaaS
fc417fc802 1/21/2026|
Those ad impressions won't optimize themselves!
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