How Did They Measure Everest Before Computers? | Smartest Year Ever (Apr 19, 2025)

How did they measure Mount Everest before satellites, drones, or even calculators? In today’s episode of Smartest Year Ever, Gordy explores how 19th-century surveyors pulled off one of the most impressive feats of pre-digital science — calculating the height of the world’s tallest mountain with stunning precision.

Long before GPS, the British-led Great Trigonometrical Survey of India used trigonometry, angle measurements, and a whole lot of patience to determine that Peak XV — later renamed Mount Everest — was the highest point on Earth. And the number they came up with? Just 29 feet off from what modern tech says today.

You’ll learn about:

• The math behind the original height calculation

• Why they couldn’t just climb it

• The forgotten local names of Everest

• And how this entire project rewrote what we knew about the Earth’s surface
  

This is a story of math, ambition, and colonial geography — and one of the most mind-blowing scientific estimates in human history.

Sources:

• Waugh, A. (1856). The Survey of Mount Everest. Royal Geographical Society.

• Green, C. S. (1999). Surveying Techniques and Early Geographical Discoveries. Journal of the Royal Asiatic Society, 33(4).

• Royal Geographical Society. (n.d.). History of Mount Everest’s Surveying. Retrieved from www.rgs.org

• Headrick, D. R. (2009). Technology: A World History. Oxford University Press.
  

#MountEverest #EverestFacts #HistoryNerd #SmartestYearEver #DailyLearning #GeoHistory #MountainTrivia #TrigonometricalSurvey #ScienceFacts #WorldGeography #GTSIndia #SurveyingHistory #intothinair #Everest #math Music thanks to Zapsplat.