Later On

A blog written for those whose interests more or less match mine.

The monumental Hoover Dam

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The use of the Platonic year was particularly interesting. Elmo Keep reports in Motherboard:

Building the Hoover Dam rerouted the most powerful river in North America. It claimed the lives of 96 workers, and the beloved site dog, Little Niggy, who is entombed by the walkway in the shade of the canyon wall. Diverting the Colorado destroyed the ecology of the region, threatening fragile native plant life and driving several species of fish nearly to extinction. The dam brought water to 8 million people and created more than 5000 jobs. It required 6.6 million metric tons of concrete, all made from the desert; enough, famously, to pave a two lane road coast to coast across the US. Inside the dam’s walls that concrete is still curing, and will be for another 60 years.

Erik, photojournalist, and I have come here to try and get the measure of this place. Nevada is the uncanny locus of disparate monuments all concerned with charting deep time, leaving messages for future generations of human beings to puzzle over the meaning of: a star map, a nuclear waste repository and a clock able to keep time for 10,000 years—all of them within a few hours drive of Las Vegas through the harsh desert.

Hoover Dam is theorized in some structural stress projections to stand for tens of thousands of years from now, and what could be its eventual undoing is mussels. The mollusks which grow in the dam’s grates will no longer be scraped away, and will multiply eventually to such density that the built up stress of the river will burst the dam’s wall. That is if the Colorado continues to flow. Otherwise erosion will take much longer to claim the structure, and possibly Oskar J.W. Hansen’s vision will be realized: future humans will find the dam 14,000 years from now, at the end of the current Platonic Year.

A Platonic Year lasts for roughly 26,000 years. It’s also known as the precession of the equinoxes, first written into the historical record in the second century BC by the Greek mathematician, Hipparchus, though there is evidence that earlier people also solved this complex equation. Earth rotates in three ways: 365 days around the sun, on its 24 hours axis and on its precessional axis. The duration of the last is the Platonic Year, where Earth is incrementally turning on a tilt pointing to its true north as the Sun’s gravity pulls on us, leaving our planet spinning like a very slow top along its orbit around the sun.

Now Earth’s true-north pole star is Polaris, in Ursula Minor, as it was at the completion of Hoover Dam. At the end of the current Platonic Year it will be Vega, in the constellation Lyra. Hansen included this information in an amazingly accurate astronomical clock, or celestial map, embedded in the terrazzo floor of the dam’s dedication monument. Hansen wanted any future humans who came across the dam to be able to know exactly when it was built.

He used the clock to mark major historical events of the last several thousand years including the birth of Christ and the building of the pyramids, events which he thought were equal to the engineering feat of men bringing water to a desert in the 1930s. He reasoned that though current languages could be dead in this future, any people who had survived that long would have advanced astronomy, math and physics in their arsenal of survival tactics. Despite this, the monument is written entirely in English, which is for the benefit of current visitors, not our descendents of millennia from now.

The Hoover Dam is staggering. It is frankly impossible, even standing right on top of it, squinting in the blinding sunlight down its vertiginous drop, to imagine how it was ever built by human beings; even as I watch old documentary footage on my laptop back in the hotel at night on Fremont Street, showing me that exact thing, I don’t believe it. I cannot square it in my mind. . .

Continue reading.

It’s a good article, and lengthy.

Written by Leisureguy

7 August 2015 at 11:18 am

Posted in Daily life

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