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How long is 812.8 feet?

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It's about one-and-one-tenth times as tall as The Golden Gate Bridge.
In other words, 812.8 feet is 1.09 times the height of The Golden Gate Bridge, and the height of The Golden Gate Bridge is 0.917 times that amount.
(San Francisco, California and Marin County, California) (height above water)
The height of each tower of Golden Gate Bridge is 745 feet above the surface of the San Francisco Bay. One of the key designers of the bridge, Charles Ellis, had no engineering degree when he began working on the project, but would later go on to write what became a standard textbook on structural engineering, and would ultimately be forced to complete his calculations on the bridge by working without pay for five months.
It's about four-fifths as long as The QE2.
In other words, 812.8 feet is 0.843 times the length of The QE2, and the length of The QE2 is 1.19 times that amount.
(a.k.a. RMS Queen Elizabeth 2) The QE2 has a total length of 965 feet. During its voyaging lifetime from 1969 through 2008, it travelled more than 31,500,000,000 feet, the furthest cumulative distance by any ship in modern history.
It's about three-fourths as tall as The Eiffel Tower.
In other words, 812.8 feet is 0.765 times the height of The Eiffel Tower, and the height of The Eiffel Tower is 1.31 times that amount.
(a.k.a. La Tour Eiffel) (Paris, France) (to flagpole peak)
The Eiffel Tower stands 1,060 feet tall, including its flagpole. The Tower is the largest structure in Paris as most other buildings are governed by a zoning restriction limiting them to a height of 121 feet or less.
It's about one-and-one-third times as tall as The Space Needle.
In other words, the height of The Space Needle is 0.741 times 812.8 feet.
(Seattle, Washington) (to aircraft warning beacon at peak)
Built for a 1962 World's Fair, the Space Needle stands 604 feet tall. With a track-and-wheel design inspired by railroad mechanics and a precisely-configured balance, the restaurant near the top of the space needle requires just a 1.5 hp motor to rotate at speeds of about 0.053 kph (0.033 mph).
It's about one-and-two-fifths times as tall as St. Paul's Cathedral.
In other words, 812.8 feet is 1.42 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 0.704 times that amount.
(London, England, United Kingdom)
St. Paul's Cathedral measures 571 feet to its peak. The southwest tower of the Cathedral contains the bell known as "Great Paul," which is the largest bell in Great Britain at 15,000 kg (16.5 tons), outweighing the more iconic Big Ben bell by about 3,000 kg (3 tons).
It's about one-and-a-half times as tall as The Washington Monument.
In other words, 812.8 feet is 1.4634 times the height of The Washington Monument, and the height of The Washington Monument is 0.68334 times that amount.
(Washington, D.C.)
The Washington Monument measures 555.41 feet tall, with some discrepancy due to the fact that the Monument's base is slightly below the surrounding ground. Interrupted in its construction by the American Civil War, it was almost 36 years between groundbreaking and the completion of construction.
It's about one-and-a-half times as tall as The Singapore Flyer (Ferris wheel).
In other words, the height of The Singapore Flyer (Ferris wheel) is 0.667 times 812.8 feet.
(a.k.a. 新加坡摩天观景轮, a.k.a. சிங்கப்பூர் ஃப்ளையர், a.k.a. Pelayang Singapura) (Marina Centre, Singapore)
The Singapore Flyer has a height of 541 feet. Based on recommendations from Feng Shui masters, the wheel was re-engineered to spin in the opposite direction five months after it began operating.