Editing 1830s (section)

=== Astronomy ===
* [[March 14]], [[1834]] – [[John Herschel]] discovers the open cluster of stars now known as [[NGC 3603]], observing from the [[Cape of Good Hope]].<ref name=Sher1965>{{cite journal|last=Sher|first=D.|title=The Curious History of NGC 3603|journal=Journal of the Royal Astronomical Society of Canada|volume=59|page=76|year=1965|bibcode=1965JRASC..59...67S}}</ref>
* [[September 30]], [[1834]] – [[Robert's Quartet]], a group of galaxies, is discovered by [[John Herschel]].<ref name="Herschel1847">{{cite book |author=Herschel, John Frederick William |url=https://books.google.com/books?id=8WBNAAAAcAAJ |title=Results of astronomical observations made during the years 1834, 5, 6, 7, 8, at the Cape of Good Hope: being the completion of a telescopic survey of the whole surface of the visible heavens, commenced in 1825 |publisher=Smith, Elder and Co. |year=1847 |volume=1 |location=London, United Kingdom |pages=51 |bibcode=1847raom.book.....H}}</ref>
* [[May 15]], [[1836]] – [[Francis Baily]], during an [[eclipse]] of the [[Sun]], observes the phenomenon named after him as [[Baily's beads]].
* [[1838]] – [[Friedrich Bessel]] makes the first accurate measurement of distance to a [[star]].
* [[1839]] – The first [[parallax]] measurement of the distance to [[Alpha Centauri]] is published by [[Thomas James Henderson|Thomas Henderson]].