Final answer:
The Earth rotates eastward approximately 15 degrees every hour as it completes a full rotation of 360 degrees in 24 hours.
Step-by-step explanation:
Earth rotates on its axis to the east every hour by approximately 15 degrees. This rotation is due to the Earth completing one full turn, that is, 360 degrees, in about 24 hours. To witness this motion, one can observe the night sky, where the stars also appear to rise in the east and set in the west due to Earth's rotation.