It restricts the speed of the rotation of earth to the exact time that makes possible the 24-hour-day, which is the length of time best adapted to the needs of man.
(It; restricts; the speed of the rotation of earth; to the exact time) (the exact time; makes; possible the 24-hour-day) (the 24-hour-day; is; the length of time best adapted to the needs of man)
It the exact time the 24-hour-day
restricts makes is
the speed of the rotation of earth to the exact time
possible the 24-hour-day
the length of time best adapted to the needs of man