The nightly motion of objects across our 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 nightly motion of objects across our sky from horizon to horizon is caused by the rotation of Earth on its axis. As Earth rotates from west to east, stars and other celestial objects appear to move from east to west across the sky. This motion is what causes the daily rising and setting of the Sun, Moon, and stars.

The Nightly Motion of Objects Across Our Sky from Horizon