alternation

And in those he appointed the hours, measured them out exactly, that man might reflect on time and count years, months, and hours, their alternation, beginning, and end, and that he might count his own life, from the beginning until death, and reflect on his sin and write his work bad and good; because no work is hidden before the Lord, that every man might know his works and never transgress all his commandments, and keep my handwriting from generation to generation.