What happened in the 1810s?
๐ 1810 - The completion of the Great Trigonometrical Survey of India, providing accurate measurements of the subcontinent.
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Further Reading
Great Trigonometrical Survey - Wikipedia (wikipedia.org)
The Great Trigonometric Survey of India: A History of How India was ... (madrascourier.com)
Mapping India | Royal Society (royalsociety.org)
The Great Trigonometrical Survey of India - LinkedIn (linkedin.com)
The Zero Stones of Pune and London; and Measuring the Whole ... (home.blog)
Sir George Everest (surveyhistory.org)
History: The Great Trigonometrical Survey (pdx.edu)
The spark that fired the great trigonometrical survey of India (edu.au)