The word(s) "variation" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) Most surely in the variation of the night and the day, and what Allah has created in the heavens and the earth, there are signs for a people who guard (against evil).

(2) And (in) the variation of the night and the day, and (in) what Allah sends down of sustenance from the cloud, then gives life thereby to the earth after its death, and (in) the changing of the winds, there are signs for a people who understand.