Board Thread:Warhammer 40k General Discussion/@comment-24383134-20140113002832/@comment-6078851-20140113133216

well the astronomican is like a lighthouse beaming through the night of the warp, at least that's my interpretation, so any species that has warp based psychic powers should be able to sense it on some level.

although i would question if weirdboyz can: ork psychic powers aren't quite the same as other species'. their power seems to be derived simply from the volume of orks in an area instead of drawing it from the warp...

codex quote..."weirdboyz are the most psychicaly powerful of all orks. they act as a focal point for the psychic energy subconciously generated by their greenskin comrades, energy that binds them together with a common purpose. weirdboyz resonate with the power of sheer orkiness, and the more orks there are nearby, the higher the charge held within their bodies."

rather than being warp based ork psychics seem to be self generated so maybe they can't 'see' the astronomican. but then again tyranid psychics also seem to be self generated (or hive mind generated) so maybe orks can 'see' it.

besides them though i would think that any species that uses the warp as the basis of psychic abilities ought to be able to 'see' the astronomican, in fact it would probably be quite difficult not to see it :)