Editing Delphinus (section)

==Characteristics==
Delphinus is bordered by [[Vulpecula]] to the north, [[Sagitta]] to the northwest, [[Aquila (constellation)|Aquila]] to the west and southwest, [[Aquarius (constellation)|Aquarius]] to the southeast, [[Equuleus]] to the east and [[Pegasus (constellation)|Pegasus]] to the east.<ref name="boundary" /> Covering 188.5&nbsp;square degrees, corresponding to 0.457% of the sky, it ranks 69th of the 88 constellations in size.<ref name=tirionconst>{{cite web| url=http://www.ianridpath.com/constellations1.html | title=Constellations: Andromeda–Indus | work= Star Tales |author=Ridpath, Ian|publisher=Self-published | access-date= 4 March 2016| author-link=Ian Ridpath }}</ref> The three-letter abbreviation for the constellation, as adopted by the IAU in 1922, is "Del".<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 [[Eugène Joseph Delporte|Eugène Delporte]] in 1930, are defined by a polygon of 14 segments. In the [[equatorial coordinate system]], the [[right ascension]] coordinates of these borders lie between {{RA|20|14|14.1594}} and {{RA|21|08|59.6073}}, while the [[declination]] coordinates are between {{DEC|+2.4021468}} and {{DEC|+20.9399471}}.<ref name="boundary" /> The whole constellation is visible to observers north of latitude [[69th parallel south|69°S]].<ref name=tirionconst/>{{efn|1=While parts of the constellation rise above the horizon to observers between 69°S and [[87th parallel south|87°S]], stars within a few degrees of the horizon are practically unobservable.<ref name=tirionconst/>}}