Who were the main astronomers that named the constellations?

In 150 A.D., the Greek scientist Ptolemy published a book, known by its Arabic name, The Almagest, which contained a summary of Greek astronomical knowledge, including a catalog of 1022 stars, with estimates of their brightness, arranged into 48 constellations.

Explanation:

youre right there are

a lot of people sadly don't know the best way to learn is cheating off of your friends or this amazing thing called google