For Song Lines, when a certain constellation - of their own - appears at a certain position, a story is told about that constellation and all the stars that are the constellation. Gathered around a campfire, folk hear of a journey made by some hero who went to all the stars until he had made the outline and was right back at where he started from. The stars used for the constellation represent terrestrial locations which are visited by the tribe as they journey here and there for either food sources, climate changes, or visiting other areas and folk for rituals, meetings or just a plain catch-up.
When the locations of the journey undertaken are mapped out, they look exactly like a version of the constellation that holds the myth/legend for the tribe. They have dozens upon dozens of such stories, all relating to certain times of the year and where certain stars/constellations are.
One great story is about the lady who went to the sky in a boat that was tethered to Earth, searching for her son who went up to the sky and got lost. She had a grand adventure visiting all kinds of characters and places up there, and when it was time to come back, she just pulled her rope in and brought herself back down. I don't know how old that one is, nor how many tribal groups have it or something similar...but it is apparently tens of thousands of years old.
I like the Aborigines and their ways...such an old culture that was unchanged until Europeans came here...such an amazing way of living that is tens of thousands of years old. We look at Egyptians and wonder what they mean with some of their myths and legends when they most certainly look at the sky for most of what the retell.
The Sun God is everywhere...personified in a leader or king of such standing that he may actually journey to the stars if the conditions are right. Priests may offer a way for him to do that but if the Pharaoh is the chief priest, and can avail himself of all kinds of secrets from all kinds of temples in not only his realm but those of his neighbours, then all manner of knowledge can be compiled in one person's head...and he may just work out a way to construct something based upon all manner of things.
Add in some dramas that are supposed to represent secrets of the stars and the Pharaoh may just give himself the right headspace that says to all "I went there and came back, and lived as a god among gods. We are now favoured in life".
That's what it's supposed to be, isn't it?
He just needs a vehicle to get there and do what they up there do...float in space. And maybe some intoxicating substances to bring all those beliefs to life inside not just him but also those partaking of whatever rites and rituals are being performed where the heavens are brought down to Earth.
Good old pyramid and its field...what a grand stage in which to mimic tales of old.