The Great Trigonometrical Survey of India was one of the most noteworthy contributions that the British made to India. Nobody had mapped so much of the Earth’s surface before this project. Among many of its remarkable achievements, it helped identify the world’s tallest peak! And Chennai is where it all started…

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Image Attributions:

1. Mount Everest: By Mount_Everest_as_seen_from_Drukair2.jpg: shrimpo1967derivative work: Papa Lima Whiskey 2 (talk) - This file was derived from: Mount Everest as seen from Drukair2.jpg:, CC BY-SA 2.0, [ Ссылка ]

2. Index Chart of the Great Trigonometric Survey of India: By Survey of India - Survey of India, Public Domain, [ Ссылка ]

3. Plan of Lambton's Trigonometrical Survey: By Survey of India - Survey of India ([ Ссылка ]), Public Domain, [ Ссылка ]

4. Map of Ancient India: By Alain Manesson Mallet - [ Ссылка ], Public Domain, [ Ссылка ]

5. India Map, 1603: By Abraham Ortelius - [ Ссылка ], Public Domain, [ Ссылка ]

6. Portuguese Map of India: By Jeronimo de Ataide, João Teixeira - Taboas geraes de toda a navegação, Public Domain, [ Ссылка ]

7. William Lambton: By William Havell (1782–1857) - [ Ссылка ], Public Domain, [ Ссылка ]

8. General Plan of Triangulation: By William Lambton - Lambton, William (1811). "An account of the Trigonometrical Operations in crossing the peninsula of India, and connecting Fort St. George with Mangalore". Asiatic Researches; or Transactions of the Society Instituted in Bengal for inquiring into the History and Antiquities: 290-384., Public Domain, [ Ссылка ]

9. Index to the Great Trigonometrical Survey, 1922: By Survey of India, Government of India - Report of the Survey of India for 1921–22, Public Domain, [ Ссылка ]

10. Calcutta Baseline: By Sketch by James Prinsep - Reprint in Historical records of the survey of India. Volume 4. 1830-1843 by R.H. Phillimore. (1954), Public Domain, [ Ссылка ]

11. Nolji Tower: By C D Simons - A sketch of the geography and geology of the Himalaya Mountains and Tibet Part I, Public Domain, [ Ссылка ]

12. GTS Ridge Stone, Karnataka: By Vinay Bhat - Own work, CC BY-SA 4.0, [ Ссылка ]

13. GTS Tower, Gopegarh: By Tirtha Tanay Mandal - Own work, CC BY-SA 4.0, [ Ссылка ]

14. GTS Tower, Paikpara: By Indrajit Das - Own work, CC BY-SA 4.0, [ Ссылка ]

15. Bangalore Baseline: By L. Shyamal - Own work, CC BY-SA 3.0,
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16. Mount Everest: By Rdevany - This is a digital photograph that I took, CC BY-SA 3.0, [ Ссылка ]

17. Oblate Spheroid: CC BY-SA 3.0, [ Ссылка ]

18. George Everest: By Maull & Polyblank - [ Ссылка ], Public Domain, [ Ссылка ]

19. Notes from A.S. Waugh: By Andrew Waugh - "Papers relating to the Himalaya and Mount Everest" in Proceedings of the Royal Geographical Society of London, Vol. I (1857), p. 346, Public Domain, [ Ссылка ]

20. Everest from Darjeeling: By Bourne & Shepherd - [ Ссылка ], CC BY 4.0, [ Ссылка ]

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