Gottfried Heinsius (April, 1709 – May 21, 1769) was a German mathematician, geographer and astronomer. He was born near

Naumburg Naumburg () is a town in (and the administrative capital of) the district Burgenlandkreis, in the state of Saxony-Anhalt, Central Germany (cultural area), Central Germany. It has a population of around 33,000. The Naumburg Cathedral became a UNES ...

and was awarded a Ph.D. in 1733 from the

University of Leipzig Leipzig University (german: Universität Leipzig), in Leipzig in Saxony, Germany, is one of the world's oldest universities and the second-oldest university (by consecutive years of existence) in Germany. The university was founded on 2 Decemb ...

with a dissertation on ''De viribus motricibus''. Later he became professor of mathematics at the same institution. Professor Heinsius may have been the first to publish an announcement about the return of

Halley's comet Halley's Comet or Comet Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 75–79 years. Halley is the only known short-period comet that is regularly visible to the naked eye from Earth, and thus the o ...

in 1759. From 1736–43 he taught in

St. Petersburg Saint Petersburg ( rus, links=no, Санкт-Петербург, a=Ru-Sankt Peterburg Leningrad Petrograd Piter.ogg, r=Sankt-Peterburg, p=ˈsankt pʲɪtʲɪrˈburk), formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), i ...

with

Leonhard Euler Leonhard Euler ( , ; 15 April 170718 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in ma ...

and was a member of the St. Petersburg Academy of Sciences. While in Russia, he was given the task to provide the Russian

Tsar Tsar ( or ), also spelled ''czar'', ''tzar'', or ''csar'', is a title used by East Slavs, East and South Slavs, South Slavic monarchs. The term is derived from the Latin word ''Caesar (title), caesar'', which was intended to mean "emperor" i ...

Ivan VI Ivan VI,; – (Julian calendar should be used in this article) Iván or Ioánn Antónovich (12 August 1740 5 July 1764) was an infant emperor of Russia who was overthrown by his cousin Elizabeth Petrovna in 1741. He was only two months old whe ...

with a horoscope. He died in

Leipzig Leipzig ( , ; Upper Saxon: ) is the most populous city in the German state of Saxony. Leipzig's population of 605,407 inhabitants (1.1 million in the larger urban zone) as of 2021 places the city as Germany's eighth most populous, as wel ...

. The crater Heinsius on the

Moon The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of ...

is named after him.

References

1709 births 1769 deaths 18th-century German astronomers {{Germany-astronomer-stub