The moon is the satellite of the earth that revolves around it. It does not have its own light. It shines by means of the light of the sun. The moon does not always look of the same shape. The size of the moon increases from first lunar day (ekum) to the day of the full moon (poornima) and then decreases after this. On the day of the dark moon (amabasva), the moon is not visible. This increasing-decreasing sequence of the moon is called the arts of the moon.
