Editing 1781 in science (section)

==Astronomy==
* March 13 – [[William Herschel]] observes [[Uranus]] (although initially recording it as a comet).<ref>{{cite journal|title=Account of a Comet, By Mr. Herschel, F.R.S.; Communicated by Dr. Watson, Jun. of Bath, F.R.S|journal=[[Philosophical Transactions of the Royal Society]]|location=London|volume=71|pages=492–501|bibcode=1781RSPT...71..492H|doi=10.1098/rstl.1781.0056|year=1781|last1=Herschel|first1=W.|last2=Watson|first2=Dr.|s2cid=186208953}}</ref>
* March 20 – [[Pierre Méchain]] discovers [[dwarf galaxy]] [[NGC 5195]].
* [[Charles Messier]]'s final catalogue of [[Messier object]]s is published.
* [[Christian Mayer (astronomer)|Christian Mayer]]'s catalogue of [[binary star]]s is published.<ref>"[http://spider.seds.org/spider/Doubles/cmayer.html Verzeichniss aller bisher entdeckten Doppeltsterne]" In [[Johann Elert Bode]]'s ''Astronomisches Jahrbuch'' for 1784, pp. 183-6.</ref>