What telescope instrument is used to counter the eastward rotation of Earth?
A) Newtonian focus
B) sidereal drive
C) active optics
D) Cassegrain focus
E) floppy mirrors

Question

Quizplus · Accepted Answer

A sidereal drive is used in telescopes to counteract Earth's rotation, allowing the telescope to track the motion of stars and other celestial objects across the sky. This mechanism adjusts the telescope's position at the same rate as the Earth's rotation, but in the opposite direction, enabling long exposure photographs of the night sky without star trails.

What Telescope Instrument Is Used to Counter the Eastward Rotation