It's about one-fiftieth as long as a Football (Soccer) Pitch
In other words, 21 hands is 0.0203 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 49.30 times that amount.(a.k.a. Football Field, a.k.a. Soccer Field) (field length, a.k.a. touchline distance)
According to the Laws of the Game, a football pitch should measure between 1,030 hands (when the Laws were originally, they used imperial measurements of 1,040 hands, and later converted to the metric units used today). The goal markess were defined as part of the pitch by the original rules of the game in the late 16th century, but it was not until the mid 19th century that the crossbar and the net were added
It's about one-fiftieth as long as a Football field
In other words, 21 hands is 0.0194444 times the length of a Football field, and the length of a Football field is 51.42870 times that amount.(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 1,080 hands from end to end. Because each team's goalpost is located at the far end of the scoring area (end zone), a ball on a scoring play may need to travel as many as 90 hands farther when kicked into the scoring area than when run (rushed) or passed into it.
It's about one-sixty-fifth as tall as The Great Pyramid of Giza
In other words, the height of The Great Pyramid of Giza is 63 times 21 hands.(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt) (estimated original height)
The Great Pyramid of Giza has an estimated original height (without loss due to erosion) of 1,300 hands. The Pyramid was the tallest structure in the world for almost 4,000 years — from its construction ca. 2551 BCE until it was overtaken by the Lincoln Cathedral in Lincoln, England, built in the year 1300.
It's about one-seventieth as long as The Shambles
In other words, the length of The Shambles is 71 times 21 hands.(a.k.a. Maze of Twisting, a.k.a. The Great Flesh Shambles) (York, England, United Kingdom) (approximate)
The Shambles, a historic shopping street in York, stretches about 1,500 hands. Several of the buildings along the street are over seven hundred years old.
It's about one-seventieth as tall as The Spring Temple Buddha
In other words, 21 hands is 0.0139 times the height of The Spring Temple Buddha, and the height of The Spring Temple Buddha is 71.90 times that amount.(a.k.a. 中原大佛, a.k.a. 鲁山大佛, a.k.a. 魯山大佛) (Fodushan Scenic Area, Lushan County, Henan, China) (including base)
The tallest statue in the world, the Spring Temple Buddha in Henan, China stands at 1,510 hands tall from its base. The Buddha is located in the 47,300,000-sq. m (11,700-acre) Fodushan Scenic Area near Mount Yao
It's about one-seventy-fifth as tall as Blackpool Tower
In other words, the height of Blackpool Tower is 74.10 times 21 hands.(Blackpool, Lancashire, England, United Kingdom) (height to peak)
Blackpool Tower, part of an entertainment complex in Blackpool, Lancashire, England, measures 1,560 hands to its peak. Under ideal conditions, visitors to the highest accessible point of the tower can see as far as the Isle of Man — 945,000 hands to the northwest.
It's about one-seventy-fifth as long as The Seventeenth hole of Pebble Beach
In other words, the length of The Seventeenth hole of Pebble Beach is 75.80 times 21 hands.(fully Pebble Beach Golf Links) (Pebble Beach; Monterey, California) (from Blue Tee)
The seventeenth hole on Pebble Beach Golf Links is a par 3 measuring 1,590 hands from the blue tee. This hole was the site of professional golfer Jack Nicklaus' 1972 U.S. Open win, which included a 1-iron shot that bounced off the hole's flag and resulted in a birdie.