Assertion: telescope's mirror | /r/CapableOf | experience torque
Facets:
value: about an axis
type: OTHER
value: in a frame of reference
type: LOCATION
Source sentences:
text: Usually (except if the telescope is located at one of the Earth's poles), the two rotations interact so that, in a frame of reference that is stationary relative to the local surface of the Earth, the mirror experiences a torque about an axis that is perpendicular to both rotation axes, i.e. a horizontal axis aligned east–west.