Linked from
The 8 pages that link to Celestial pole, each with the reason it gives.
DeclinationRelated: The poles mark the extreme declinations of +90° and −90°.
Celestial equatorRelated: They are the endpoints of the axis perpendicular to the celestial equator.
Armillary sphereRelated: The polar axis supports the rotation represented by many armillary models.
Circumpolar starRelated: Circumpolar stars trace circles centered on the celestial pole.
Equatorial mountRelated: The mount’s aligned axis points toward a celestial pole.