Here is a directory to all the myths and sky lore I know. It should be noted that these stores as you see them here are being told in the way I first read or was told. You may have heard something different because many sacred stories have several variations to them.
Stories about the cosmos and creation of the stars
A couple of Scandinavian constellations
Orion the Hunter
The Big and Little Dippers
The Big and Little Bears
The Constellations of the Zodiac
Hercules the Strongman
Perseus the Hero
Various Stories of Monsters and Heroes
Various Astronomical Phenomenon