Editing Apus (section)

==Characteristics==
Covering 206.3 square degrees and hence 0.5002% of the sky, Apus ranks 67th of the [[88 modern constellations]] by area.<ref name=tirionconst>{{cite web| url=http://www.ianridpath.com/constellations1.html | title=Constellations: Andromeda–Indus | work= Star Tales |author=Ridpath, Ian |author-link=Ian Ridpath|publisher=self-published | access-date= 26 August 2015}}</ref> Its position in the [[Southern Celestial Hemisphere]] means that the whole [[constellation]] is visible to observers south of [[7th parallel north|7°N]].<ref name=tirionconst/>{{efn|1=While parts of the constellation technically rise above the horizon to observers between the [[7th parallel north|7°N]] and [[22nd parallel north|22°N]], stars within a few degrees of the horizon are to all intents and purposes unobservable.<ref name=tirionconst/>}} It is bordered by [[Ara (constellation)|Ara]], [[Triangulum Australe]] and [[Circinus]] to the north, [[Musca]] and [[Chamaeleon]] to the west, Octans to the south, and [[Pavo (constellation)|Pavo]] to the east. The three-letter abbreviation for the constellation, as adopted by the [[International Astronomical Union]] in 1922, is "Aps".<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 (US magazine)|Popular Astronomy]] | volume=30 | page=469 | bibcode=1922PA.....30..469R | date=1922 }}</ref> The official constellation boundaries, as set by Belgian astronomer [[Eugène Joseph Delporte|Eugène Delporte]] in 1930,{{efn|1=Delporte had proposed standardising the constellation boundaries to the International Astronomical Union, who had agreed and gave him the lead role.<ref name=tirionconstbnd>{{cite web| url=http://www.ianridpath.com/boundaries.html | title=Constellation boundaries: How the modern constellation outlines came to be| work= Star Tales |author=Ridpath, Ian |author-link=Ian Ridpath|publisher=self-published | access-date= 1 June 2016}}</ref>}} are defined by a polygon of six segments (''illustrated in infobox''). In the [[equatorial coordinate system]], the [[right ascension]] coordinates of these borders lie between {{RA|13|49.5}} and {{RA|18|27.3}}, while the [[declination]] coordinates are between −67.48° and −83.12°.<ref name="boundary" />