It's about 1,500 times as long as a Grain of Sand
In other words, 21 hands is 1,710 times the length of a Grain of Sand, and the length of a Grain of Sand is 0.000585 times that amount.(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.0123 hands. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 149 hands in height.
It's about one-two-thousandth as long as The Hollywood Walk of Fame
In other words, 21 hands is 0.00055 times the length of The Hollywood Walk of Fame, and the length of The Hollywood Walk of Fame is 1,800 times that amount.(Hollywood Boulevard and Vine Street, Hollywood, California) (approximate length)
The Hollywood Walk of Fame is approximately 38,000 hands. Gene Autry, most famous as the singer of "Back in the Saddle Again" and as the writer and singer of "Here Comes Santa Claus," is the only entertainer to have a star in every category — film, television, recording, radio, and theater. One of Autry's stars is also one of only two stars which have been stolen from the Walk and never recovered.
It's about one-two-thousandth as long as The Indianapolis Motor Speedway
In other words, 21 hands is 0.000530303 times the length of The Indianapolis Motor Speedway, and the length of The Indianapolis Motor Speedway is 1,885.710 times that amount.(Speedway, Indiana) (rectangular oval course)
The rectangular oval course of the Indianapolis Motor Speedway is 39,600 hands. While famous for its automotive racing, the first motorsport held at the track was a series of motorcycle races in August, 1909 — a little less than two years before the inaugural Indianapolis 500 race was run.
It's about one-two-thousandth as long as Daytona International Speedway
In other words, 21 hands is 0.000530303 times the length of Daytona International Speedway, and the length of Daytona International Speedway is 1,885.710 times that amount.(Daytona Beach, Florida) (tri-oval course)
The tri-oval course of the Daytona International Speedway, upon which the NASCAR Daytona 500 is run, is 39,600 hands in length. Although the tri-oval design is said to allow for greater visibility during the race, the real reason for the then-unique design was that plot available for construction of the track was only 350 acres and could not accommodate a traditional oval layout of appropriate length.
It's about one-two-thousand-five-hundredth as tall as a Puncak Jaya
In other words, 21 hands is 0.0004369 times the height of a Puncak Jaya, and the height of a Puncak Jaya is 2,289 times that amount.(a.k.a. Mt. Carstensz, a.k.a. Carstensz Pyramid, a.k.a. Nemangkawi, a.k.a. Carstensz Toppen, a.k.a. Gunung Sukarno) (Papua province, Indonesia)
The highest point in Oceania (and therefore one of the seven summits) peak of Puncak Jaya is 48,070 hands. Dutch explorer Jan Carstenszoon, the mountain's namesake, is said to have been ridiculed for claiming to have seen snow near the equator when he reported his discovery of the peak in 1623.
It's about one-two-thousand-five-hundredth as tall as a Vinson Massif
In other words, 21 hands is 0.0004361 times the height of a Vinson Massif, and the height of a Vinson Massif is 2,293 times that amount.(a.k.a. Mount Vinson) (Antarctica)
Mount Vinson, the highest peak of the Vinson Massif mountain, reaches 48,150 hands at its peak. The mountain is named after Georgia Congressman Carl Vinson who emphatically promoted Antarctic exploration in the 1930s.
It's about one-two-thousand-five-hundredth as tall as Mount Elbrus
In other words, 21 hands is 0.0003782 times the height of Mount Elbrus, and the height of Mount Elbrus is 2,644 times that amount.(a.k.a. Mingi Tau, a.k.a. Эльбрус, a.k.a. იალბუზი) (Karachay-Cherkessia and Kabardino-Balkaria, Russia) (west summit)
The west summit of the dual-summit volcano Mount Elbrus is 55,530 hands at its peak and is the highest peak in both Russia and the European continent. Until 1976, a cable car would take visitors to the mountain as far up as the Garabashi camp, located at an elevation of 37,400 hands.