From the
Bureau of Reclamation's webpage on artwork at the dam:
Surrounding the base is a terrazzo floor, inlaid with a star chart,
or celestial map. The chart preserves for future generations the date
on which President Franklin D. Roosevelt dedicated Hoover Dam, September
30, 1935.
The apparent magnitudes of stars on the chart are shown as they would
appear to the naked eye at a distance of about 190 trillion miles from
earth. In reality, the distance to most of the stars is more than 950
trillion miles.
In this celestial map, the bodies of the solar system are placed so
exactly that those versed in astronomy could calculate the precession
(progressively earlier occurrence) of the Pole Star for approximately
the next 14,000 years. Conversely, future generations could look upon
this monument and determine, if no other means were available, the exact
date on which Hoover Dam was dedicated.
Photo from a
gallery of images.
The claim of calculating an "exact date" sounds fanciful; calculating
the correct century or decade would perhaps be more likely.
No comments:
Post a Comment