explain brief about prominent constellations with diagrams
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Explanation:
A constellation is a name given to a group of stars in the sky that make up a certain pattern. Sometimes this pattern is imaginary. When the sky is clear these stars can be seen from Earth without the use of a telescope.
There are 88 named constellations, and they take many forms, including mythological creatures, animals, people and objects. The name is usually given based on the shape made by the brightest stars within the constellation. Some of these shapes appear much more obvious than others. Sometimes there is a smaller shape distinguishable within the constellation that is also given a name, this is known as an asterism.
People have gazed up at the stars for many thousands of years and 48 of the 88 constellations recognised today were named in Ancient Greece. Constellation is a Latin word meaning “set with stars”.
Before the compass was invented, people used the stars to navigate, mainly when sailing across the ocean. They used a constellation called the Ursa Minor to identify the location of Polaris, also known as the North Star. This allowed them to calculate their latitude and work out which direction they were travelling in. This map of the sky was also used as a rough calendar.