The exact wording 'The path of the souls' is most common in native american belief and refers to the Milky Way it self(the bright band as seen from earth).
I found this quote a bit intriguing:
'Souls journeyed to the west where they made a leap of faith to the sky. The souls then made a journey along the Milky Way until they reached the most important spot on the path. This was at the Great Rift of the Milky Way, where they encountered an enigmatic Adversary located at the Constellation of Cygnus.'
and
'Sirius and Antares are the dog stars that guards the ends of the "path of souls', the Milky Way. Sirius, in the winter sky, guards the eastern end, while Antares in the summer sky, guards the western end.'
Be sure to bring enough food for both dogs or you will be wandering the path for eternity.
In my point of view, if the path of the souls is the Milky Way as it could be seen from the Earth, this is a kind of confirmation that the starting point is at Sol (the Phaethon's argument and also the fact that Drew Wagar told us that it will be very usefull to have the Sol's permit soon).
Thoughts : I found very interesting that, in the native american belief, Sirius was the guardian of the eastern end in the winter sky. Remember : winter is coming ^^
But we must have in mind that the Sun, from the Earth, begin his journey from the East, and its ending to the West (I don't know if it is realy relevant, just putting it here as it was come to my mind when I read your comment).
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