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File:Roy Distance between the Royal Observatories of Greenwich and Paris Plate IX map of triangulation, Published 1790.png

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Map of cross-channel triangulation

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Description
English: Map of cross-channel triangulation to determine the distance between the Royal Observatories of Greenwich and London. Plate IX from: Roy, William (1790). "An account of the trigonometrical operation, whereby the distance between the meridians of the Royal Observatories of Greenwich and Paris has been determined". Philosophical Transactions of the Royal Society of London 80: 111-614.
Date
Source https://archive.org/details/philtrans00940584
Author William Roy (1726-1790)

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