What is the scientfic reasoning of the constellation, canis major being where it is now?

not the mythological reason|||Random chance, plus the human need to make patterns where none exist.|||Everything has be be somewhere. Your question is unclear.|||Just by random. Ancient people looked up and saw 88 objects in the sky created by stars. There is no explanation why they are there, they just are, never moving never changing (actually they are but most of the constellations wont change for about another 3,000 years). There are billions of stars in our galaxy. Some of the brighter closer ones are visible to us. The more stars we could see the more constellations we could make.|||IAU drew the boundaries of the constellations in the 1930s. That designates which constellations are where in the sky.


The classical figures were drawn on sky globes thousands of years ago, as an effort to illustrate legends from the civilizations.


As to the scientific reasoning as to why Canis Major is where it is now, as the sun and those stars revolve around the center of our galaxy, Sirius and other Canis Major stars have moved with our solar system. Most of those stars are in or near the Orion arm of the Milky Way. Beyond those details, one can say it is only chance, gravitational forces and naming conventions by humans that put constellations where they are.|||Constellations are just made up names for random patterns of stars that people see in the sky. Kind of like looking at clouds and saying that one looks like an elephant or whatever. So there is no science behind it at all. It is more cultural, or just in people's imagination.