What is a constellation? Name any two constellations ?

Hint:The celestial sphere in astronomy and navigation is an imaginary sphere of an infinitely broad radius, concentric with the Earth. It is possible to view all objects in the sky of the observer as reflected on the inner surface of the celestial sphere as if they were the underside of a dome.

Complete answer:
A collection of stars that can be identified as a recognisable object, such as an animal or a defined object, is called a constellation. The outlines of the constellations mimic certain people's recognisable objects. You can conveniently recognize any of the constellations in the night sky. You should know how a certain constellation appears and where to look for it in the night sky. In a constellation, the stars tend to be on the same plane when we look at them from very far.

One of the most common constellations you can see in the early part of the night during the summer is Ursa Major. It's also known as the Big Dipper, the Great Bear, or the Saptarshi. The Ursa Major is built like a ladle and is also known as the Big Dipper. In this constellation, there are seven famous stars. It looks like a big ladle or a question mark. There are three stars in the ladle handle and four in the cup.

Orion is another well-known star that can be seen in the late evenings during the season.The Orion is a common constellation, formed in the form of a hunter. Three middle stars in Orion pointed to a brighter star in the sky named Sirius. It's one of the most majestic constellations in the sky. It has got seven or eight brilliant stars. The three middle stars reflect the hunter's belt. The four bright stars tend to be grouped in a quadrilateral pattern.

Note: Any of the star names we know come from the ancient civilizations of the Middle East, Greece and Rome. Clusters of stars were described as gods, goddesses, beasts, and the subjects of their tales. There are 48 "old" constellations and they are the brightest groupings of stars.