Editing Circinius IV

{{Status|Canon}}
{{Planet infobox
|name=Circinius IV
|image=[[File:CAMS - afar.jpg|300px]]
|system=[[Circinius system]]{{Ref/Reuse|Enc22}}
|body=
|position=Fourth planet
|moon(s)=At least three<ref name="part1"/>
|diameter=
|gravity=
|daylength=
|yearlength=
|atmosphere=[[Oxygen]]-[[Wikipedia:Nitrogen|nitrogen]]
|temperature=
|demonym=
|species=[[Human]] {{C|Non-native}}
|population=
|colonized=[[2430]]{{Ref/Book|Id=Enc22|Enc22|Page=50}}
|government=[[Unified Earth Government]]
}}
'''Circinius IV'''{{Ref/Note|Official material from [[343 Industries]] consistently renders the planet's name as "Circinius-IV". The same naming scheme is used for [[Draetheus V]] from ''[[Halo: Spartan Assault]]''. However, ''Halopedia'' omits the hyphen for the sake of convenience and for consistency with other planetary designations (''e.g.'' [[Jericho VII]] and [[Draco III]]).}} was a [[Unified Earth Government]] [[Outer Colonies|Outer]] [[human colony|colony]] [[world]] in the [[Circinius system]].{{Ref/Reuse|Enc22}}{{Ref/Note|Id=date|Only the Outer Colonies were [[Siege of the Inner Colonies|attacked]] pre-[[2536]].}} The planet was orbited by at least three [[natural satellite]]s. It was the location of the [[Corbulo Academy of Military Science]], an [[Officer Candidate School|officer training school]] for the offspring of high-ranking UNSC officials.<ref name="part1">'''[[Halo 4: Forward Unto Dawn]]''', ''Part 1''</ref> The [[space elevator]] located at Corbulo Academy was considered one of the planet's most spectacular sites.<ref>[https://www.youtube.com/watch?v=j0XgIEQ8NR8 '''YouTube''': ''Halo Channel Premiere'']</ref>

==Overview==
===Environmental features===
The environments of Circinius IV around Corbulo Academy featured dense forests, snow-capped mountains, valleys, and rivers, strikingly similar to the Pacific Northwest of [[Earth]].{{Ref/Note|''Halo 4: Forward Unto Dawn'' was shot partly on-location in Vancouver, BC.}}

[[File:CirciniusIVMountainValley.png|250px|thumb|left|A forested valley on Circinius IV.]]

====Locations====
*[[Corbulo Academy of Military Science]]

===Ecology===
Much of its flora appeared identical to Earth species, such as trees resembling [[Wikipedia:Douglas fir|Douglas fir]] (a species found on [[Reach]]), Western hemlock, Western red cedar, Sitka spruce, Vine maple, Red alder, Pacific dogwood, Black cottonwood, and Western paper birch, shrubs resembling hazelnut, huckleberry, and hawthorn, multiple species of fern, aerial mosses coating large surfaces of some trees, terrestrial mosses forming dense spongy layers on the ground, as well as cryptogam growth such as crustose lichens, which grew on UNSC field depots in the forests.

[[File:H4FUD DepotConcept2.jpg|250px|thumb|right|Concept art depicting a UNSC field depot in a dense forest.]]

Corbulo Academy incorporated many species from the surrounding environment into its landscaping. Its topiaries resembled boxwood, a common species used in decorative hedges on Earth.

Circinius IV had plentiful small flying insects. The presence of flowering plants suggests some type of pollinators.

==History==
===Human-Covenant war===
{{Main|Battle of Circinius IV}}
After the [[First Battle of Harvest|first engagements]] on [[Harvest]], [[ONI Section Two|ONI Section II]] kept the [[Covenant]] invasion secret from the general population. However, Corbulo Academy's superintendent, [[General]] [[Daniel Black]], was informed. As preparation for a possible attack, Black discreetly increased the readiness of the [[UNSC Marine Corps|UNSC Marine]] garrison posted in the academy and authorized limited communications blackouts under the guise of routine maintenance procedures.{{Ref/Reuse|part1}}

The colony and the academy were [[Battle of Circinius IV|attacked]] by the [[Covenant]] during the earliest days of the [[Human-Covenant War]] on [[2526|April 26, 2526]].<ref>[https://forums.halowaypoint.com/yaf_postsm2482554_Today-in-Halo.aspx#post2482554 '''Halo Waypoint Forums''' - ''Today in Halo'']</ref> Orbiting UNSC vessels soon deployed [[Orbital Drop Shock Troopers]] directly onto Corbulo Academy's campus. The planet's [[space elevator]] was also destroyed, killing many of the escaping cadets as it fell.<ref>'''Halo 4: Forward Unto Dawn''', ''Episode 3''</ref> During the battle, the Covenant killed almost the entire population of the planet. Only [[Hastati Squad|four cadets]] from Corbulo Academy survived the initial assault,<ref>'''Halo 4: Forward Unto Dawn''', ''Episode 4''</ref> although one of them, [[Chyler Silva]], died during the battle. Later, the planet was [[Glassing|glassed]] by the Covenant.<ref>'''Halo 4: Forward Unto Dawn''', ''Episode 5''</ref>

At some point following the planet's invasion, the UNSC launched [[Operation: ABLE SENTRY]] on Circinius IV to investigate Covenant activity on the planet. [[Edward Buck]] participated in this operation. Directly afterwards, [[Operation: PHALANX]] was initiated and carried out by UNSC personnel, including [[John-117]], to rescue civilians on Circinius IV and to investigate Covenant invasion patterns.{{Ref/Game|Halo 5: Guardians Limited Edition|[[Halo 5: Guardians Limited Edition dossiers#Edward Buck|Dossier files]] - Edward Buck}}{{Ref/Game|Id=H5GLtd|Halo 5: Guardians Limited Edition|[[Halo 5: Guardians Limited Edition dossiers#John-117|Dossier files]] - John-117}}

==Production notes==
*Along with [[Hat Yai]], Circinius IV is not mentioned in the [[The Assembly|Assembly]]'s report on glassed worlds (dated [[2530|January 1, 2530]]) in [[Data pads#Data pad 14|data pad 14]] from ''[[Halo: Reach]]''. From a real-world perspective, the obvious explanation is that the planet was created after the game's release, there is no clear in-universe reason for this omission. However, given that both worlds had some form of human population on their surface following their presumed glassing dates,{{Ref/Reuse|H5GLtd}} it is possible that both Circinius IV and Hat Yai were not entirely glassed by the Covenant.
*As ''Halo 4: Forward Unto Dawn'' was shot partly on-location at [[Wikipedia: Simon Fraser University|Simon Fraser University]] and [[Wikipedia:Burnaby Mountain|Burnaby Mountain]] in Vancouver, much of its plant life are real-world species common to the Pacific Northwest, identified from the [https://www.sfu.ca/archaeology/engagement/garden/plants.html Simon Fraser University Native Plant Garden List] and the [http://scec.ca/pdf/BBY/BBYMtnMng_AppendixG_181.pdf Management Plan for Burnaby Mountain Conservation Area].
{{Linkbox|gallery=yes}}

==Gallery==
<gallery>
File:H4FUD Corbulo Academy.jpg|The grounds of the Corbulo Academy of Military Science on Circinius IV.
File:CirciniusIVForestNight.png|A forest on Circinius IV at night.
File:FUD-Circinius-Mountains.jpg|One of Circinius IV's mountain ranges.
File:FUD-Corbulo-Glassed.jpg|Circinius IV being glassed by the Covenant.
File:H2A CirciniusDestroyedConcept.jpg|Unused concept art of Circinius IV for ''[[Halo 2: Anniversary]]'''s [[Terminal (Halo 2: Anniversary)|terminals]], seemingly showing the world blown to pieces. 
</gallery>

==List of appearances==
*''[[Halo 4: Forward Unto Dawn]]'' {{1st}}
*''[[Halo 4]]'' {{Mo}}
*''[[Halo 2: Anniversary]]''
*''[[Halo 5: Guardians]]'' {{Mo}}
**''[[Halo 5: Guardians Limited Edition dossiers|Limited Edition dossiers]]'' {{Mo}}
*''[[Halo: Silent Storm]]'' {{Mo}}
*''[[Halo: Oblivion]]'' {{Mo}}

==Notes==
{{Ref/Notes}}

==Sources==
{{Ref/Sources}}

[[Category:Planets]]
[[Category:Human colonies]]