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
Where Sanguinius was found
The larger of Baal's two irradiated moons, populated by tribes who survived a nuclear war none of them started. Sanguinius's pod came down here and the tribe that raised him is why the IX Legion recruits from moons rather than the planet.
Age of the ImperiumM32–M40
imperium
Blood Angels recruiting moon
The Chapter's aspirants still cross its deserts on foot, and most of them do not.
The 41st Millenniumpre-Rift
imperium
Blood Angels recruiting moon
Also recorded as Baalfora. Unchanged in ten thousand years except in who is allowed to leave.
Era Indomituspost-Rift
imperium
Besieged, then held
Hive Fleet Leviathan reached the moons before the planet. The Blood Angels lost most of a Chapter defending them.
Position
Map frame: 620, 285 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 246 units ≈ 26.2k light years, north-east of the galactic core.
Height above the disk plane: 7.4 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.