Final answer:
The equatorial system divides the celestial sphere using the celestial poles and the celestial equator.
Step-by-step explanation:
The equatorial system divides the celestial sphere by using the celestial poles and the celestial equator. The celestial poles are the points where Earth's axis extends into the sky, and they mark the axis of rotation for the celestial sphere. The north celestial pole is visible to most people living north of the equator. The celestial equator, which lies halfway between the celestial poles, is an imaginary projection of Earth's equator onto the sky.