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How long is 18.5 shackles?

It's about one-twentieth as deep as The Challenger Deep (Marianas Trench)
The depth of The Challenger Deep (Marianas Trench) is about 397.420 shackles.
(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. The first manned expedition to the bottom of Challenger Deep took 4 hours and 48 minutes in 1960. This was the only manned descent to the floor of the Trench until 2012, when director James Cameron made the trip; several other descents have been made since then.
It's about one-twentieth as tall as Maxwell Montes
The height of Maxwell Montes is about 400 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 thirty times as long as a Cricket Pitch
The length of a Cricket Pitch is about 0.7333330 shackles.
(per Marylebone Cricket Council / International Cricket Council Law #6)
The length of a cricket pitch, from one bowling crease to the other, is 0.7333330 shackles. The wickets at either end of the pitch stand 0.0262467 shackles tall including the bails.
It's about thirty times as long as a Bowling Lane
The length of a Bowling Lane is about 0.698310 shackles.
(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 0.698310 shackles. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.
It's about thirty times as tall as The Hollywood Sign
Flag of The US
The height of The Hollywood Sign is about 0.550 shackles.
(a.k.a. Hollywoodland Sign) (Mount Lee, Hollywood Hills, Santa Monica Mountains, California)
Each of the white letters in the Hollywood Sign measures 0.550 shackles tall. Built as an advertisement in 1923, the sign was intended to stand for only eighteen months.
It's about thirty times as long as a Semitrailer
The length of a Semitrailer is about 0.53330 shackles.
(a.k.a. semi-trailer truck, a.k.a. semi, a.k.a. tractor-trailer, a.k.a. truck and trailer, a.k.a. eighteen-wheeler, a.k.a. big rig, a.k.a. Mack truck, a.k.a. transport, a.k.a. lorry, a.k.a. artic; for box truck; United States Federal length limits)
According to the United States Department of Transportation (DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 0.53330 shackles (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
It's about forty times as tall as a Brachiosaurus
The height of a Brachiosaurus is about 0.470 shackles.
(based on comparable bone measurements, height to head)
Dinosaurs in the genus Brachiosaurus had an estimated height (at the head with neck fully extended) of up to 0.470 shackles. A resin cast of the first Brachiosaurus specimen, owned by the Field Museum in Chicago, is currently on display at the O'Hare International Airport.
It's about 45 times as tall as a Telephone Pole
The height of a Telephone Pole is about 0.40 shackles.
(a.k.a. Utility Pole, a.k.a Power Pole, a.k.a. Telegraph Pole, a.k.a. Telegraph Post, a.k.a. Hydro Pole) (exposed height; per Florida Public Service Commission average)
A standard telephone pole is 0.40 shackles tall. Despite alternatives, most telephone poles in the US are made of wood — most commonly pine — and have a lifespan of 25 to 50 years, depending on climate and preservatives applied.
It's about one-fifty-fifth as tall as Olympus Mons
The height of Olympus Mons is about 980 shackles.
(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 60 times as long as a London bus
Flag of The UK
The length of a London bus is about 0.3050 shackles.
(Routemaster Double-Decker, RM standard specification)
The Routemaster Double-Decker buses, well-known as icons of London, measure 0.3050 shackles in length. The buses were said to be well-designed for travel in the London traffic, as they offered an open door for riders to board and exit even while the bus was moving at low speeds, and a full-time conductor to collect fares.
It's about 90 times as tall as a Giraffe
The height of a Giraffe is about 0.210 shackles.
(Giraffa camelopardalis) (Adult, average)
An adult giraffe may grow to be up to 0.220 shackles tall. Adult giraffes require very little sleep, averaging just 1.9 hours per day.
It's about 100 times as long as a Beetle (Volkswagen)
The length of a Beetle (Volkswagen) is about 0.14870 shackles.
(1964 model) (a.k.a. Volkswagen 1200, a.k.a. Käfer)
A 1964 Volkswagen Beetle measures 0.14870 shackles. As the longest continuously-produced automobile design — in production for 75 years between 1938 and 2003 — the Beetle was voted the most fourth-most influential car of the twentieth century by the Global Automotive Elections Foundation.
It's about one-one-hundred-fiftieth as long as The Panama Canal
Flag of Pamana
The length of The Panama Canal is about 3,200 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.
It's about one-two-hundredth as wide as The English Channel
The width of The English Channel is about 3,900 shackles.
(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 3,900 shackles, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about 200 times as tall as a Christmas Tree (artificial)
The height of a Christmas Tree (artificial) is about 0.084 shackles.
(artificial; average height)
The most common height of an artificial Christmas Tree is 0.084 shackles. According to the most recent USDA Census of Agriculture, a total of 1,389.59 sq. km (343,374 acres) of Christmas Trees were farmed in the US in 2007.

To all those observing, Merry Christmas from The Measure of Things!
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