[philman_36]

Would the solstice alone without navigation tools be that precise?
The sun is what is needed to find the solstice, not navigation tools.

And there is also the question of mechanicle ability to move and place the stones.
How much could a 15-20 foot person lift? What about two of them?

Who needs machines?

[patriot torch]

All good points. Again, its an interesting subject to try to find understanding.