They refer to a decay and sinking below the earth and its actualities to the imum coeli, to the hidden God (Deus absconditus) and the land of nous, a hidden earth.
Hillman identifies the Deus absconditus explicitly with Saturn’s melancholic interiority, locating the Hidden God at the psyche’s lowest and innermost register — the imum coeli — as the ground of contemplative geometry and nostalgia.
, Senex & Puer, 2015thesis