midnight
Theos at once came swiftly up beside him , and looked where he looked , . . what a scene of terrific splendor he beheld ! ... Right across the horizon , that glistened with a pale green hue like newly frozen water , a cloud , black as the blackest midnight , lay heavy and motionless , in form resembling an enormous leaf , fringed at the edges with tremulous lines of gold . This nebulous mass was absolutely stirless , . . it appeared as though it had been thrown , a ponderous weight , into the vault of heaven , and having fallen , there purposed to remain .