From an astronomical point of view, therefore, the task of the telescope mounting is to compensate for the Earth's rotation and allow the observer to track the Moon, planets, and stars.
(the task of the telescope mounting; is; to compensate for the Earth's rotation and allow the observer to track the Moon, planets, and stars)
the task of the telescope mounting
is
to compensate for the Earth's rotation and allow the observer to track the Moon, planets, and stars