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==
===Topography and climate===
Circinius IV features dense forests and mountains as well as large bodies of water.<ref name="part1"/>
====Locations====
*[[Corbulo Academy of Military Science]]

==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}}

==Behind the scenes==
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.
{{Linkbox|gallery=yes}}

==Gallery==
<gallery>
File:H4FUD Corbulo Academy.jpg|The grounds of the Corbulo Academy of Military Science on Circinius IV.
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]]