"None" in Latin refers to the "ninth hour," which would typically be around mid-afternoon.  The monastic community gathers together once again to recall the hour that Jesus died upon the cross and for the grace that was bestowed on the world by his self-giving.  As the day's light begins to shift and the shadows lengthen, so we, too, start to experience a decline as the sun descends.  We recall that God's Son descends into the darkness at the moment of his death but we keep that unwavering faith in his resurrection.