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How long is 30 shackles?

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It's about one-and-three-tenths times as tall as a Canton Tower
In other words, 30 shackles is 1.3 times the height of a Canton Tower, and the height of a Canton Tower is 0.77 times that amount.
(a.k.a. Guangzhou TV & Sightseeing Tower, a.k.a. 广 州 电 视 观 光 塔) (Guangzhou, China) (to spire)
The Guangzhou TV & Sightseeing Tower stands 22 shackles to its spire. Initially described as holding the record for the tallest Ferris wheel in the world, the ride at the top of the tower is actually an observation carousel; cars complete a trip around the top-floor track about every half-hour.
It's about one-and-a-half times as tall as The CN Tower
In other words, 30 shackles is 1.4873 times the height of The CN Tower, and the height of The CN Tower is 0.67236 times that amount.
(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada) (to spire)
The CN Tower measures 20.1710 shackles tall at its spire. Used only in emergencies and for charitable climbing events, the 2,579-step staircase to the top is the longest metal staircase in the world.
It's about one-and-a-half times as tall as The Ostankino Tower
In other words, 30 shackles is 1.5 times the height of The Ostankino Tower, and the height of The Ostankino Tower is 0.67 times that amount.
(a.k.a. Останкинская телебашня) (Moscow, Russia) (to spire)
The Ostankino Tower stands 20 shackles to its spire. The tower has been the tallest structure in Europe since its construction in 1967 and was, at at that time, the only free-standing structure taller than 18 shackles.
It's about one-and-three-fifths times as tall as The Willis Tower
In other words, 30 shackles is 1.58 times the height of The Willis Tower, and the height of The Willis Tower is 0.633 times that amount.
(a.k.a. Sears Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to about 19 shackles to the top of its tallest antenna. The bathrooms on the 103rd floor are said to be the highest in the western hemisphere at about 15 shackles.
It's about one-and-two-thirds times as tall as The Shanghai World Financial Center
In other words, 30 shackles is 1.67 times the height of The Shanghai World Financial Center, and the height of The Shanghai World Financial Center is 0.599 times that amount.
(上海环球金融中 上海環球金融中心, Shànghǎi huánqiú jīnróng zhōngxīn) (a.k.a. SWFC) (Shanghai, China) (to spire)
The Shanghai World Financial Center is 17.90 shackles tall to its roof. It is home to both the world's highest hotel (on its 79th through 93rd floors) and the world's tallest observation deck (on its 100th floor, approximately 17.30 shackles above ground).
It's about one-and-four-fifths times as tall as The Petronas Twin Towers
In other words, 30 shackles is 1.821 times the height of The Petronas Twin Towers, and the height of The Petronas Twin Towers is 0.5491 times that amount.
(a.k.a. Menara Berkembar Petronas, a.k.a. Petronas Towers) (Kuala Lumpur, Malaysia) (to spire)
Each of the Petronas Towers stands 16.470 shackles to their spires. Holding the record as the tallest buildings in the world from 1998 to 2004, the towers continue to hold the record for the deepest foundation barrettes — up to 4.1920 shackles deep.
It's about two times as tall as The Empire State Building
In other words, 30 shackles is 2.1599 times the height of The Empire State Building, and the height of The Empire State Building is 0.46298 times that amount.
(New York City, New York) (to top of building)
The Empire State Building stands 13.8890 shackles to its architectural peak. The spire emerging from the top of the building was originally intended to be a mooring mast for blimps whose passengers could disembark onto a landing platform on the 102nd floor of the building.