The celestial sphere mimics earth 's rotation by turning about imaginary points in the sky once every 24 hours.
Explanation: The celestial sphere is an imaginary sphere its round the earth at the center. the celestial sphere rotates on the celestial axis, it moves from the earth north and south poles and extends out the celestial bodies. Due to the earth rotation, the sky appears blue.
The celestial bodies rotates from the east to west. This process is called diurnal motion off the celestial bodies, this makes the daily rotation of the earth on its axis. It causes the sky to rotate as a whole once every 24 hours.
