Explanation:

You may also see the moon on most of the days. It may, however, appear at different times, in different  shapes and at different positions. You can see the full moon only once in about a month’s time. It is  Full moon night or Poornima. A fortnight later, you cannot see it at all. It is a New moon night or  Amavasya. On this day, you can watch the night sky best, provided it is a clear night.