Editing 1723 in science

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The year '''1723 in [[science]]''' and [[technology]] involved some significant events.

==Geophysics==
* [[George Graham (clockmaker)|George Graham]] discovers diurnal variation in [[Earth's magnetic field]].<ref>{{cite journal|last=Graham|first=George|year=1724|title=An Account of Observations Made of the Variation of the Horizontal Needle at London, in the Latter Part of the Year 1722, and Beginning of 1723|journal=[[Philosophical Transactions of the Royal Society]]|volume=33|pages=96–107|doi=10.1098/rstl.1724.0020}}</ref><ref>{{cite journal|last=Graham|first=George|year=1724|title=Observations of the Dipping Needle, Made at London, in the Beginning of the Year 1723|journal=Phil. Trans.|volume=33|pages=332–339|doi=10.1098/rstl.1724.0062|doi-access=free}}</ref>
* [[Antoine de Jussieu]] publishes ''De l'Origine et des usages de la Pierre de Foudre'' on the origins of [[fossil]]s, prehistoric [[stone tool]]s and [[meteorites]].<ref>{{cite web|url=http://rr0.org/data/1/9/7/8/Westrum_TheCaseOfMeteorites_SocialStudiesOfScience/03/index_fr.html|title=Les pierres de foudre|accessdate=2011-10-18}}</ref>

==Optics==
* [[Giacomo F. Maraldi]] makes the first observation of the [[Arago spot]], unrecognized at this time.<ref>{{cite book|last=Hecht|first=Eugene|title=Optics|location=San Francisco|publisher=Addison Wesley|year=2002|edition=4th|isbn=0-8053-8566-5|page=494}}</ref>

==Births==
* January 5 – [[Nicole-Reine Lepaute]], French astronomer (died [[1788 in science|1788]])
* January 31 – [[Petronella Johanna de Timmerman]], Dutch scientist (died [[1786 in science|1786]])
* February 17 – [[Tobias Mayer]], German [[cartographer]], [[astronomer]] and [[physicist]] (died [[1762 in science|1762]])
* April 30 – [[Mathurin Jacques Brisson]], French [[zoologist]] (died [[1806 in science|1806]])
* November 12 – [[Saverio Manetti]], Italian natural historian (died [[1785 in science|1785]])

==Deaths==
* August 26 – [[Anton van Leeuwenhoek]], [[Netherlands|Dutch]] pioneer of the [[microscope]] (born [[1632 in science|1632]])

==References==
{{reflist}}

[[Category:1723 in science| ]]
[[Category:18th century in science]]
[[Category:1720s in science]]