Assertion (A): The same face of the Moon is always presented to the Earth.

Reason (R): The Moon rotates about its own axis in days which is about the same time that it takes to orbit the earth.

Both A and R are true and R is the correct explanation of A.

The correct answer is Option (1) - Both A and R are true and R is the correct explanation of A.

• Assertion (A): This statement is accurate. From Earth's perspective, we only see the same side of the Moon most of the time. This is also known as the "near side" or "Earth-facing side" of the Moon. However, it's important to note that due to a phenomenon called libration, we can actually see about 59% of the Moon's surface over time.
• Reason (R): This statement is also accurate. The Moon, like most celestial bodies, participates in two motions: rotation and revolution. Rotation refers to spinning on its own axis, and revolution refers to orbiting another object. In the Moon's case:
  • Rotation: It takes the Moon approximately 27.3 days to complete one rotation on its own axis.
  • Revolution: It also takes the Moon approximately 27.3 days to complete one revolution around the Earth.

Therefore, because the Moon takes the same amount of time to rotate on its axis as it does to revolve around the Earth, it presents the same side to Earth most of the time. This phenomenon is called synchronous rotation or tidal locking.