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Mapping India: The Great Trigonometrical Survey Explained

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Did you know it took 65 years to map India, and the accuracy was within 7.2 feet—long before GPS even existed? In this video, we explore the incredible history of the Great Trigonometrical Survey of India. From half-ton instruments carried on bullock carts to the genius of Radhanath Sikdar, discover how surveyors battled malaria and treacherous terrain to measure the curvature of the Earth and the height of Mt. Everest. Timestamps: 00:00 - The impossible 65-year mission 00:32 - William Lambton and the Arc of the Meridian (1802) 01:00 - George Everest takes the reigns 01:28 - Sironj: The central point of India’s grid 02:15 - Comparing 19th-century math to modern results 02:55 - The birth of the Everest 1830 Datum 03:22 - Radhanath Sikdar: The man who measured Everest 04:07 - Why the height of Peak XV was "too perfect" 05:08 - Is a 200-year-old survey still useful today? 05:49 - The equipment: Half-ton tools on bullock carts #OffshoreSurveys #GTS #HistoryOfScience #Surveying #IndiaHistory #Geodesy #MtEverest #RadhanathSikdar Various Sources & Reference - https://en.wikipedia.org/wiki/Great_Trigonometrical_Survey Historical Records of the Survey of India Vol III - By Col RH Phillimore Indian Journal of History of Science, 50.4 (2015) 642-645 - Trigonometrical Survey of India and Naming of Peak XV as Mt. Everest www.rangan-dutta.info G & RB Section of Survey of India Lambton, William (1811). "An account of the Trigonometrical Operations in crossing the peninsula of India, and connecting Fort St. George with Mangalore" Markham, Clements (1878). A Memoir on the Indian Surveys

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