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How long is 2.50 shackles?

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It's about two-fifths as long as The Seventeenth hole of Pebble Beach.
In other words, 2.50 shackles is 0.4230 times the length of The Seventeenth hole of Pebble Beach, and the length of The Seventeenth hole of Pebble Beach is 2.360 times that amount.
(fully Pebble Beach Golf Links) (Pebble Beach; Monterey, California) (from Blue Tee)
The seventeenth hole on Pebble Beach Golf Links is a par 3 measuring 5.910 shackles from the blue tee. This hole was the site of professional golfer Jack Nicklaus' 1972 U.S. Open win, which included a 1-iron shot that bounced off the hole's flag and resulted in a birdie.
It's about two-fifths as tall as The Singapore Flyer (Ferris wheel).
In other words, 2.50 shackles is 0.4160 times the height of The Singapore Flyer (Ferris wheel), and the height of The Singapore Flyer (Ferris wheel) is 2.40 times that amount.
(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 6.01 shackles. Based on recommendations from Feng Shui masters, the wheel was re-engineered to spin in the opposite direction five months after it began operating.
It's about two-fifths as tall as The Washington Monument.
In other words, 2.50 shackles is 0.40510 times the height of The Washington Monument, and the height of The Washington Monument is 2.46850 times that amount.
(Washington, D.C.)
The Washington Monument measures 6.17130 shackles 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 two-and-a-half times as long as Baseball base distances.
In other words, the length of Baseball base distances is 0.40 times 2.50 shackles.
(MLB Official Baseball Rules specification)
According to MLB Official Baseball Rules, the distance between baseball diamond bases is 1 shackles. While second and home base are located upon the corners of the 27.432 sq. m area created by the bases, first and third base are placed within that square, to better allow the umpires to judge whether a ball is fair or foul.
It's about two-fifths as tall as St. Paul's Cathedral.
In other words, 2.50 shackles is 0.3940 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 2.540 times that amount.
(London, England, United Kingdom)
St. Paul's Cathedral measures 6.340 shackles 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 two-fifths as tall as The Space Needle.
In other words, 2.50 shackles is 0.3730 times the height of The Space Needle, and the height of The Space Needle is 2.680 times that amount.
(Seattle, Washington) (to aircraft warning beacon at peak)
Built for a 1962 World's Fair, the Space Needle stands 6.710 shackles 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 three-tenths as tall as The Golden Gate Bridge.
In other words, 2.50 shackles is 0.3020 times the height of The Golden Gate Bridge, and the height of The Golden Gate Bridge is 3.310 times that amount.
(San Francisco, California and Marin County, California) (height above water)
The height of each tower of Golden Gate Bridge is 8.280 shackles 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.