Editing Piscis Austrinus (section)

==Characteristics==
Piscis Austrinus is a constellation bordered by [[Capricornus]] to the northwest, [[Microscopium]] to the southwest, Grus to the south, [[Sculptor (constellation)|Sculptor]] to the east, and Aquarius to the north. Its recommended three-letter abbreviation, as adopted by the [[International Astronomical Union]] in 1922, is "PsA".<ref name=pa30_469>{{cite journal | last=Russell | first=Henry Norris |author-link=Henry Norris Russell | title=The new international symbols for the constellations | journal=Popular Astronomy | volume=30 | page=469 | bibcode=1922PA.....30..469R | date=1922 }}</ref> [[Ptolemy]] called the constellation ''Ichthus Notios'' "Southern Fish" in his ''[[Almagest]]''; this was Latinised to Piscis Notius and used by German celestial cartographers [[Johann Bayer]] and [[Johann Elert Bode]].<ref name=ridpathPsA>{{cite web| url=http://www.ianridpath.com/startales/piscisaustrinus.html | title=Piscis Austrinus - The Southern Fish |last1=Ridpath|first1=Ian|publisher=self-published |work=Star Tales | access-date= 23 March 2019}}</ref> Bayer also called it Piscis Meridanus and Piscis Austrinus, while French astronomer [[Nicolas-Louis de Lacaille]] called it Piscis Australis. English [[Astronomer Royal]] [[John Flamsteed]] went with Piscis Austrinus, which was followed by most subsequently.<ref name=wagman/> The official constellation boundaries, as set by Belgian astronomer [[Eugène Delporte]] in 1930, are defined by a polygon of four segments (''illustrated in infobox''). In the [[equatorial coordinate system]], the [[right ascension]] coordinates of these borders lie between {{RA|21|27.3}} and {{RA|23|06.5}}, while the [[declination]] coordinates are between −24.83° and −36.46°.<ref name=boundary>{{Cite journal | title=Piscis Austrinus, constellation boundary | journal=The Constellations | publisher=International Astronomical Union | url=https://www.iau.org/public/themes/constellations/#psa | access-date=20 August 2012}}</ref> The whole constellation is visible to observers south of latitude [[53rd parallel north|53°N]].<ref name=tirionconst>{{cite web| url=http://www.ianridpath.com/constellations2.html | title=Constellations: Lacerta–Vulpecula | work= Star Tales |author=Ian Ridpath|publisher=Self-published | access-date= 25 November 2018| author-link=Ian Ridpath }}</ref>{{efn|1=While parts of the constellation technically rise above the horizon to observers between 53°N and [[65th parallel north|65°N]], stars within a few degrees of the horizon are to all intents and purposes unobservable.<ref name=tirionconst/>}}