THE DACIAN ANDESITE SUN ALTAR AND ITS STONE RAY: ANOTHER SWORD IN THE STONE?

Images Courtesy http://www.cosmopoetry.ro/astrosarmizegetusas/

Many years ago, in my book THE MYSTERIES OF AVALON (due to be revised sometime in the next year), I discussed all the various motifs that might have gone into the origin and development of the Arthurian Sword in the Stone story (or Sword in the Anvil atop a Stone story).  Here is a piece that built upon those earlier researches:

https://mistshadows.blogspot.com/2017/09/the-sword-in-stone-seax-and-sun-stone.html

More recently, I suggested that the Sword in the Stone was more of a Sword on the Stone, and might be represented by images of the Dacian falx carved on dedicatory altars at the Birdoswald Roman fort on Hadrian's Wall:

https://mistshadows.blogspot.com/2019/02/a-contributive-motif-to-sword-in-stone.html  

But I kept coming back to something that other Arthurian scholars have noticed (see, for example, http://www.maryjones.us/jce/swordstone.html).  That is, the Sword in the Stone motif seemed to have a sacred-seasonal element.  While I was thinking along these lines, I happened to stumble across the great stone altar called the Andesite Sun, discovered in a religious precinct in the ancient capital of Dacia.  This altar, upon which sacrifices were offered, is believed to have been the scene of magical rituals involving Dacian warriors.  For details, see sources such as the following article: 

https://www.researchgate.net/publication/259673423_Andesite_Sun_in_Carpathian_Mountain

What really caught my eye is the altar's so-called stone arrow or ray, a line a large stone blocks that marks directional north.  It seems to pierce the altar like a sword. The position of the sun's shadow upon the ray/arrow had special significance when calculating the passage of the solar year.

My question regarding this altar and its arrow or ray is a simple one: could knowledge of it have traveled to Hadrian's Wall with the Dacian soldiers?  And did some vague folk memory of it percolate down to later generations, only to reemerge in the story of the Sword in the Stone?

Seems unlikely, to be sure.  But religious tradition is very conservative, durable, even tenacious.  The reader is referred to the first link to my blog site posted above for my thoughts on Stonehenge and its Heel Stone, which as it happens align themselves very well with what we now perceive to be the function of the Dacian Andesite Sun and its stone ray.