Great Trigonometrical Survey

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The Great Trigonometrical Survey of India was a project that aimed to carry out a survey across the Indian subcontinent with scientific precision. It was begun in 1802 by the British infantry officer William Lambton, under the auspices of the East India Company.

Excerpt from the Wikipedia article “Great Trigonometrical Survey”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Survey of India, Public domain, via Wikimedia Commons.