Question

John saw the full moon on a particular day. After how many days will he be able to see the full moon again?

Answer 1

Lunar Cycle:

1. The lunar cycle is the cycle of the moon appearing from the new moon to the full moon.
2. This lunar cycle has a duration of $28$ days.
3. This means that if John sees a full moon on a particular day, the moon will complete its full lunar cycle in the next $28$ days, allowing John to come across the full moon in the ${29}^{th}$ day again.
4. In the first $14$ days, or the first half of the lunar cycle, the full moon reduces to zero. This day is called as the new moon where the moon cannot be seen.
5. In the next $14$ days, or the second half of the lunar cycle, the size of the moon increases gradually, and finally, on the last day, we are able to see the entire moon.
6. Hence, the full moon cycles back again on the ${29}^{th}$ day.

Hence, John will be able to see the moon after $29$ days.