Question

we cannot observe all constellation in a single night from a place give reason​

Answer 1

Answer:

To be precise, the stars in one constellations are neither gravitationally bound nor are they close together in space. Each one of them follows its own path through our Galaxy. As a result, the shape of the whole pattern changes over a very long time. Stick around for a few hundred years and you will notice it too!

hope it helps you