Which preposition to use with unchanging

in Occurrences 2%

Stern, clean-cut, youthful faces were set northward, unchanging in the shadowy, pale gleams of the night.

in Occurrences 1%

" "Since you made Miss Bellingham's acquaintance, perhaps?" suggested Mr. Jellicoe, himself as unchanging in aspect as an Egyptian effigy.

through Occurrences 1%

He looked up at the great front of the Cathedral, unchanging through so many changing years, and, as he looked, he thought how small and ephemeral a thing he was and his love and grief.

at Occurrences 1%

Grant her a friend to stand unchanging at her side, A youth of sunshine and an old age tranquil, A spirit where together peace and hope abide.

Which preposition to use with  unchanging