In ancient times, when there was no artificial light, the night sky would be so bright and full of stars around the world. It’s easily possible every culture (of the same hemisphere) saw the stars and grouped them differently. For example, the Babylonians, Egyptians, Ancient Hindus, Ancient Islamics and Ancient Hebrews all had their own constellations.
It’s just the ones that are known today are most the longest lasting set of constellations based on their region of influence.
They are based on a modernized version of the Hellenistic constellations, from around the Roman times. Due to the wide influence of the Romans and following civilizations, these are the constellations that became “mainstream” and are attributed as of today.
TLDR there isn’t a distinctive, objective pattern in the sky. It’s more each civilization created stories based around their perception, and the most influential civilization had their constellation system last.
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