longnow.org
26,000-Year Astronomical Monument
A celestial map on the Dam marks completion via axial precession.
About 26,000-Year Astronomical Monument
Explores a celestial map embedded in Hoover Dam's Monument Plaza that marks the dam's construction date via Earth's axial precession. The article recounts the author's visit, archival research, and its connection to Long Now's long-range thinking.
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