* Constellations are not "created": They are patterns of stars that ancient civilizations identified and named based on their perceived shapes. The Cancer constellation has been recognized for thousands of years.
* Ancient origins: The Cancer constellation's origins are likely Babylonian or even earlier. It's associated with the crab that, in Greek mythology, attacked Heracles during his battle with the Hydra.
So, while there's no single astronomer who "created" Cancer, many astronomers throughout history have studied and documented it, contributing to our understanding of its stars and their properties.
