[Paduan (Brett)]

Hi my name is Brett i am new to astronomy but have had an interest for a long time, now am finally doing something about it. i may have this in the wrong forum but here goes. i am trying to learn the constellations by lightly drawing pencil lines in my star atlas like a join the dots. my beef is that the basic 12 signs of the zodiac have been around for thousands of years yet no two websites can agree on how the stars are arranged i am having problems with Sagittarius in particular but it is not the only one is there any where i can get the real arrangement or is it a little hit and miss like Chinese whispers. Wikipedia shows three variations alone
Cheers