It's about one-nine-hundredth as long as The Preakness Stakes
In other words, 21 hands is 0.001116427 times the length of The Preakness Stakes, and the length of The Preakness Stakes is 895.71460 times that amount.(Pimlico Race Course, Baltimore, Maryland) (total race length)
The total race length of the Preakness Stakes run at the Pimlico Race Course is 18,810 hands. Dubbed "the race for the Black-eyed Susans" after Maryland's state flower, the winning horse is actually draped with a garland of painted yellow daisies, as Black-eyed Susans do not bloom in time for the late-May race.
It's about one-nine-hundred-fiftieth as long as The Kentucky Derby
In other words, 21 hands is 0.00106061 times the length of The Kentucky Derby, and the length of The Kentucky Derby is 942.8540 times that amount.(Churchill Downs, Louisville, Kentucky) (total race length)
The total race length of the Kentucky Derby run at Churchill Downs is 19,800 hands. First run in 1864, the Kentucky Derby is one of the oldest continuously-running sporting events in America, almost two years older than the Westminster Kennel Club Dog Show
It's about one-one-thousandth as long as The Beast (Roller Coaster)
In other words, 21 hands is 0.0009512 times the length of The Beast (Roller Coaster), and the length of The Beast (Roller Coaster) is 1,051 times that amount.(King's Island Amusement Park; Mason, OH)
The roller coaster The Beast is 22,080 hands in length. On its twenty-fifth year of operation in 2004, The Beast was awarded the Landmark Award by the American Coaster Enthusiasts as a historically significant roller coaster.
It's about one-one-thousandth as long as The Belmont Stakes
In other words, 21 hands is 0.0008838384 times the length of The Belmont Stakes, and the length of The Belmont Stakes is 1,131.4290 times that amount.(Belmont Park, Elmont, New York) (total race length)
The total race length of the Belmont Stakes run at Belmont Park is 23,760 hands. It was during the 1974 Belmont Stakes that Secretariat set an America Grade 1 stakes record in winning by a distance of about 744 hands
It's about one-one-thousandth as long as Steel Dragon 2000
In other words, 21 hands is 0.0008607 times the length of Steel Dragon 2000, and the length of Steel Dragon 2000 is 1,162 times that amount.(a.k.a. スチールドラゴン2000) (Nagashima Span Land; Kuwana, Mie Prefecture, Japan)
The roller coaster Steel Dragon 2000 is 24,400 hands in length. It is one of only two operating "Gigacoasters" (meaning its height is between 900 hands and 1,197 hands) in the world, having a height of 954.70 hands.
It's about 1,500 times as long as a Strand of Spaghetti (thickness)
In other words, the length of a Strand of Spaghetti (thickness) is 0.00077 times 21 hands.(average; restaurant and supermarket applications) (based on FMA Omcan Italian Made TR50 Counter Top Pasta Machine Extruder 13317)
An average strand of restaurant-grade spaghetti measures 0.017 hands in thickness. In 2010, a California Buca di Beppo set a world record by preparing a 13,780-lb bowl of spaghetti, served in a swimming pool.
It's about one-one-thousand-five-hundredth as long as The National Mall
In other words, the length of The National Mall is 1,000 times 21 hands.(Washington, D.C.) (to Lincoln Memorial)
From the steps of the Capitol Building to the Lincoln Memorial, the National Mall is 30,000 hands. On December 4th, 2008, the entirety of the Mall was declared open to the public for the first time in American history in anticipation of the estimated two million visitors to the Mall for the inauguration of President Barack Obama on January 20th, 2009.