CNN  — 

It’s a fact every school child knows: Mount Everest is the tallest mountain in the world.

It’s a truth that feels ancient and inevitable, an unassailable certainty that draws hundreds of climbers to attempt the summit each year – because, in the words of George Mallory, one of the first mountaineers to conquer it, “it’s there.”

However, this fascination with the mountain whose historic Tibetan name is Qomolangma (“Holy Mother”) is a modern phenomenon and the first reconnaissance mission to its slopes was completed just a century ago, on October 25, 1921.

This is the story of how Mount Everest became the ultimate adventure challenge of our age.

Becoming the tallest

In the 19th century, the British Empire was a global industrial superpower, with a drive towards exploration and mastery. Places, people and even time itself – a standardized time system was first introduced on British railways in 1847 – were all to be categorized and measured.

The Great Trigonometrical Survey was a 70-year project by the East India Company that applied this scientific precision to the Indian subcontinent, establishing the demarcation of British territories in India and the height of the Himalayan peaks.

There had been a number of former claimants to the title of “world’s highest mountain”: Chimborazo in the Andes. Nanda Devi and Kanchenjunga in the Himalayas.

It was in 1856 that the formerly overlooked Peak XV – soon to be Mount Everest – was officially declared to be the world’s tallest mountain above sea level, at 29,002 ft (8,839.8 meters. Its official height today is a little higher – 8,849 meters).

Acquiring an English name

“People had been waiting for years to measure some of these peaks, because it seemed then that nobody had any way of getting to them, much less climbing them,” explains Craig Storti, author of “The Hunt for Mount Everest,” published this month.

Peak XV stood on the border of Nepal and Tibet (now an autonomous region of China) and both were closed to foreigners.

The mountain’s height was calculated through a series of triangulation measurements where were conducted some 170 kilometers away in Darjeeling, India.

Andrew Waugh, British Surveyor General of India, successfully argued that as the two countries were inaccessible, a local name could therefore not be found and that Peak XV should be named after his predecessor in the role, George Everest.

Everest, who initially objected to the honor bestowed upon him, had no direct involvement in the mountain’s discovery, nor did he ever get the opportunity to see it. (Incidentally, we’ve been saying it wrong: his family name was pronounced “Eev-rest”).

Opening to outsiders