File:Roy map of proposed triangulation between London and Paris, Published 1787.png
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Categories:
- An Account of the Mode Proposed to be Followed in Determining the Relative Situation of the Royal Observatories of Greenwich and Paris. By Major-General William Roy, F. R. S. and A. S. (1787)
- William Roy
- Triangulation
- Royal Observatory, Greenwich in art
- Historical images of the observatoire de Paris
- 18th-century maps of the English Channel