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Originally Posted by ThunderChild
This got me thinking : Has the Chandler just approximated constellation lines due to size constraints? Or are the shapes and make-ups of constellations not an exact science? Is there room for different opinions from source to source?
I had just made the assumtion that they were set in stone. Perhaps I was wrong there.
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Only the constellation boundaries are set in stone (well, at least for the current Epoch). Whatever is inside them is open to interpretation. While there seems to be some consensus with most constellations some seem to have several patterns - I think it all comes down to whichever pattern the author likes at the time. I regularly see two versions of Gemini. I'd go with whichever one you like best, if it helps you remember it in the sky. Plus what Volans and Vermin said too, about DSO's.