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How long is 612 spans?

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It's about four-fifths as tall as St. Paul's Cathedral
In other words, 612 spans is 0.804 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 1.24 times that amount.
(London, England, United Kingdom)
St. Paul's Cathedral measures 761 spans 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-three-tenths times as long as a Football field
In other words, 612 spans is 1.275 times the length of a Football field, and the length of a Football field is 0.784314 times that amount.
(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 480 spans from end to end. Because each team's goalpost is located at the far end of the scoring area (end zone), a ball on a scoring play may need to travel as many as 40 spans farther when kicked into the scoring area than when run (rushed) or passed into it.
It's about three-fourths as tall as The Space Needle
In other words, 612 spans is 0.76 times the height of The Space Needle, and the height of The Space Needle is 1.32 times that amount.
(Seattle, Washington) (to aircraft warning beacon at peak)
Built for a 1962 World's Fair, the Space Needle stands 805 spans 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-one-third times as long as a Football (Soccer) Pitch
In other words, 612 spans is 1.33 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 0.752 times that amount.
(a.k.a. Football Field, a.k.a. Soccer Field) (field length, a.k.a. touchline distance)
According to the Laws of the Game, a football pitch should measure between 459 spans (when the Laws were originally, they used imperial measurements of 460 spans, and later converted to the metric units used today). The goal markess were defined as part of the pitch by the original rules of the game in the late 16th century, but it was not until the mid 19th century that the crossbar and the net were added
It's about one-and-a-half times as tall as Big Ben
In other words, 612 spans is 1.5 times the height of Big Ben, and the height of Big Ben is 0.67 times that amount.
(officially the clock tower of Palace of Westminster, a.k.a. Houses of Parliament) (London, England)
The clock tower of the Palace of Westminster, which houses the bell known as "Big Ben," rises 420 spans. The tower has no elevator, and is therefore only accessible by climbing 334 steps to the top.
It's about one-and-a-half times as tall as The Statue of Liberty
In other words, 612 spans is 1.504 times the height of The Statue of Liberty, and the height of The Statue of Liberty is 0.6649 times that amount.
(a.k.a. "Liberty Enlightening the World," a.k.a. La Liberté Éclairant le Monde) (Liberty Island, New York City, New York) (pedestal base to torch peak)
The Statue of Liberty reaches 406.80 spans including the pedestal. The statue was designed using an optical trick known as "forced perspective" to make the statue appear proportionally correct when viewed from its base and is, in actuality, disproportionately large at the top.
It's about three-fifths as tall as The Golden Gate Bridge
In other words, 612 spans is 0.616 times the height of The Golden Gate Bridge, and the height of The Golden Gate Bridge is 1.62 times that amount.
(San Francisco, California and Marin County, California) (height above water)
The height of each tower of Golden Gate Bridge is 993 spans 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.