This archive tracks four layers. A record present in 4 of them (HH, AoI, M41, IND) is silent in the rest, and says so.
The Horus HeresyM30–M31
imperium
Homeworld of Jaghatai Khan and the V Legion
Steppe and grassland under an enormous sky, its plains tribes conquered by the Khan on horseback before the Emperor arrived and offered him a bigger steppe. The White Scars never adopted anyone else's way of fighting.
Age of the ImperiumM32–M40
imperium
White Scars homeworld
Imperial records call it Mundus Planus; nobody on it does.
The 41st Millenniumpre-Rift
imperium
White Scars homeworld
Invaded by Huron Blackheart's Red Corsairs at the very end of M41 while the Chapter was elsewhere, and only partly cleared afterwards.
Era Indomituspost-Rift
imperium
White Scars homeworld
Held, with neighbouring systems still in Red Corsair hands and the Rift between the Chapter and much of its recruiting range.
Position
Map frame: 670, 359 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 221 units ≈ 23.5k light years, north-east of the galactic core.
Height above the disk plane: 1.1 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Chogoris System
Books set here
3 titles in the reading tracker touch this record, 1 of them as a primary location. Titles link out to the tracker.
wh40k.lexicanum.com/wiki/Chogoris infobox Class = Adeptus Astartes Homeworld, Feudal World; rendered feral, the nearest entry in the render-class list to a feudal steppe world
gposlow
derived: Ultima Segmentum, Yasan Sector; placed in the segmentum's north and inside the Astronomican's reach — Chogoris anchors its own sector and was never a dark-side world. No published bearing exists