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1784 in science
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==Surveying== * [[William Roy]] measures the baseline for the [[Anglo-French Survey (1784β1790)]] linking the observatories of [[Paris Observatory|Paris]] and [[Royal Observatory, Greenwich|Greenwich]]. The measurement is accurate to within a few inches in a distance of over 280,000 ft., an unprecedented accuracy for this time. Roy is awarded the [[Copley Medal]] in the following year.<ref>{{cite journal|year=1785|last=Roy|first=William|title=An Account of the Measurement of a Base on Hounslow-Heath|journal=Philosophical Transactions of the Royal Society of London|volume=75|pages=385β480|url=https://archive.org/details/philtrans01222507|doi=10.1098/rstl.1785.0024|doi-access=free}}</ref>
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