Audio Guide：

Astronomical objects move on curves on the celestial sphere due to Earth’s rotation. An equatorial telescope is an instrument with a rotational axis parallel to Earth's rotational axis that can cancel the influence of Earth’s rotation so that astronomical objects will stay within the field of the telescope. A theodolite uses two parameters, the angle of elevation and azimuth, to follow an astronomical object. Due to its simple design and lower cost, large observatories currently all use theodolites as telescope mounts.

Visitors can operate the equatorial telescope and theodolite models to understand how they work.