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How long is 2.50 shackles?

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It's about one-one-hundred-fiftieth as tall as Mount Everest.
In other words, 2.50 shackles is 0.00775 times the height of Mount Everest, and the height of Mount Everest is 129 times that amount.
(a.k.a. Mount Chomolungma, a.k.a. सगरमाथा, a.k.a. Chajamlungma, a.k.a. ཇོ་མོ་གླང་མ, a.k.a. 珠穆朗玛峰, a.k.a. Zhūmùlǎngmǎ Fēng) (Sagarmatha Zone, Nepal and Tibet, China) (to summit, excluding snow depth)
Mount Everest is 323 shackles above sea level at its summit. The plate tectonics of the Indian subcontinent continuously alter the mountain's peak — raising it by 0.000146 shackles and shifting it to the northeast by 0.000164 shackles each year.
It's about one-one-hundred-fiftieth as tall as a Mauna Loa.
In other words, 2.50 shackles is 0.00748 times the height of a Mauna Loa, and the height of a Mauna Loa is 133.70 times that amount.
(Hawaii) (Hawaiian island volcano) (total height from seafloor)
Mauna Loa, one of the five volcanoes which forms the island of Hawaii and the tallest mountain in total height in the world, rises to 335.40 shackles above the seafloor. The peak of Loa is home to the approximately 6,000 sq. m (0.6 ha) Lake Waiau, one of the highest altitude lakes in the United States outside of Colorado.
It's about one-one-hundred-fiftieth as tall as The Challenger Deep (Marianas Trench).
In other words, 2.50 shackles is 0.0062906 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 158.970 times that amount.
(near Marianas Islands, a.k.a. Ladrones Islands, northwestern Pacific Ocean) (depth below sea level)
The Challenger Deep, at the southern end of the Marianas Trench, reaches a depth of 397.420 shackles below sea level. There has been only one manned expedition to the bottom of Challenger Deep — a 1960 voyage that took 4 hours and 48 minutes to reach the bottom.
It's about one-one-hundred-fiftieth as tall as Maxwell Montes.
In other words, the height of Maxwell Montes is 160 times 2.50 shackles.
(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 400 shackles. Since Venus does not seem to have the kind of tectonic activity which gives rise to mountains on Earth, the origin of the Venusian mountain remains the subject of some dispute.
It's about 200 times as tall as a Bowling Pin.
In other words, 2.50 shackles is 180 times the height of a Bowling Pin, and the height of a Bowling Pin is 0.00556 times that amount.
(USBC specifications; tenpin)
According to the United States Bowling Congress specifications, a tenpin bowling pin should be within 0.00002890 shackles of 0.0139 shackles in height. The USBC further mandates that certified pins be made of sugar maple wood, unless otherwise approved by the organization.
It's about one-four-hundredth as tall as Olympus Mons.
In other words, 2.50 shackles is 0.0025 times the height of Olympus Mons, and the height of Olympus Mons is 400 times that amount.
(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 980 shackles. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
It's about one-one-thousand-five-hundredth as long as The Panama Canal.
In other words, the length of The Panama Canal is 1,300 times 2.50 shackles.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 3,200 shackles in length. Ships passing through the Canal are raised (and then lowered) 0.950 shackles above sea level through the lock-and-dam system.