What happened in the 1800s?
π 1806 - The construction of the Great Trigonometrical Survey of India begins.
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Further Reading
Great Trigonometrical Survey - Wikipedia (wikipedia.org)
The Great Trigonometrical Survey of India - Geospatial World (geospatialworld.net)
Survey Saga: How Colonel William Lambton's ambitious journey ... (thehindu.com)
Mount Everest - named for a paragon of surveying (berntseninternational.com)
THE GREAT TRIGONOMETRICAL SURVEY OF INDIA IN A ... (econtent.in)
The Great Trigonometrical Survey: Histories Of Mapping 1790-1850 (academia.edu)
Maps and Map-making in India | The Great Trigonometrical Survey (umich.edu)
William Lambton - Wikipedia (wikipedia.org)
Sir George Everest | Trigonometrical Survey of India - YouTube (youtube.com)
Mapping India | Royal Society (royalsociety.org)