The nightly motion of objects across the sky from horizon to horizon is caused by the
A) motion of the solar system around the Galaxy.
B) revolution of Earth around the Sun.
C) rotation of the whole celestial sphere of stars around the fixed Earth.
D) rotation of Earth on its axis.

Question

Quizplus · Accepted Answer

The apparent nightly motion of objects across the sky is primarily due to the Earth's rotation on its axis. This rotation makes it seem as if the sky is moving from east to west over the course of a night.

The Nightly Motion of Objects Across the Sky from Horizon