We 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. We can’t we see the moon and all those bright tiny objects during day time because of the very bright light of the sun that does not allow us to see all these bright objects of the night sky . The sun, the moon and all those objects shining in the night sky are called celestial bodies. Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars. We may notice various patterns formed by different groups of stars. These are called constellations . Ursa Major or Big Bear is one such constellation. One of the most easily recognisable constellation is the Saptarishi (Sapta seven, rishi-sages). I...