The most readily observed east-to-west motion of objects in the night sky is caused by the:
A) relative motions of stars with respect to each other in the sky.
B) rotation of Earth on its axis.
C) rotation of the whole universe around a fixed axis near the Great Attractor.
D) revolution of Earth in its orbit around the Sun.

Question

Quizplus · Accepted Answer

The rotation of Earth on its axis causes the apparent east-to-west motion of objects in the night sky. As Earth rotates, objects in the sky appear to move from east to west, giving the impression of a daily cycle of rising and setting. This is the most readily observable motion in the night sky.

The Most Readily Observed East-To-West Motion of Objects in the Night