Editing Ursa Major (section)

==Characteristics==

Ursa Major covers 1279.66 square degrees or 3.10% of the total sky, making it the third largest constellation.<ref>{{cite web|title=Constellations Lacerta–Vulpecula|url=http://www.ianridpath.com/constellations2.html}}</ref> In 1930, [[Eugène Joseph Delporte|Eugène Delporte]] set its official International Astronomical Union (IAU) constellation boundaries, defining it as a 28-sided irregular polygon. In the [[equatorial coordinate system]], the constellation stretches between the [[right ascension]] coordinates of {{RA|08|08.3}} and {{RA|14|29.0}} and the [[declination]] coordinates of +28.30° and +73.14°.<ref name="boundary">{{cite journal
 |title       = Ursa Major, Constellation Boundary
 |journal        = The Constellations
 |publisher   = International Astronomical Union
 |url         = https://www.iau.org/public/themes/constellations/#uma
 |access-date  = 16 August 2019
 }}</ref> Ursa Major borders eight other constellations: [[Draco (constellation)|Draco]] to the north and northeast, [[Boötes (constellation)|Boötes]] to the east, [[Canes Venatici (constellation)|Canes Venatici]] to the east and southeast, [[Coma Berenices (constellation)|Coma Berenices]] to the southeast, [[Leo (constellation)|Leo]] and [[Leo Minor (constellation)|Leo Minor]] to the south, [[Lynx (constellation)|Lynx]] to the southwest and [[Camelopardalis (constellation)|Camelopardalis]] to the northwest. The three-letter constellation abbreviation "UMa" was adopted by the IAU in 1922.<ref>{{cite web |url=https://www.iau.org/public/themes/constellations/ |title=The Constellations |access-date=2019-06-07}}</ref>