This archive tracks four layers. A record present in 2 of them (M41, IND) is silent in the rest, and says so.
The Horus HeresyM30–M31
[RECORD LOST]
No record for this location in The Horus Heresy.
Age of the ImperiumM32–M40
[RECORD LOST]
No record for this location in Age of the Imperium.
The 41st Millenniumpre-Rift
imperium
Fortress world of the Bastior Sub-sector
A garrison world doing an unglamorous job on a quiet border, which is the sort of place that turns out to matter.
Era Indomituspost-Rift
imperiumImperium Sanctus
Anchor of the Sanctus Line, then a grave
Fortified into the wall that keeps the enemy off the road to Sol, and the world a Tyranid vanguard ate anyway. What was learned here is the only reason the next world held.
Position
Map frame: 208, 470 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 294 units ≈ 31.2k light years, west of the galactic core.
Height above the disk plane: 4.7 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Regium System
Books set here
1 title in the reading tracker touches this record, 1 of them as a primary location. Titles link out to the tracker.
Every fact in this record, and where it came from. Editorial derivations say so.
segmentumhigh
wh40k.lexicanum.com/wiki/Regium infobox Segmentum = Segmentum Pacificus; Subsector = Bastior Sub-sector; System = Regium System; Class = 'Dead World, former Fortress World'
regionhigh
wh40k.lexicanum.com/wiki/Sanctus_Line 'an Imperial region of Segmentum Pacificus, that was turned into a massive defensive fortification in M42, due to sharing a border with Segmentum Solar'. Regium's own article files it in that line
gposmedium
derived: Segmentum Pacificus, on the Solar border, because that border is the whole definition of the Sanctus Line. Placed at the Pacificus edge nearest the Solar block