Three pictures of where the dome foundation is going. I’ve stood a fourteen foot plank up, at the center point, to indicate the height at the center of dome — one foot above grade of foundation exposure and thirteen feet height at the center of the dome. The diameter is eleven feet; which is the distance from the center pole to: the edge of the burn barrel at the left, and the blue pick axe (actually a ‘grub hoe’) at the left rear.
Now to figure out how to excavate (maybe blast some ledge) and pour concrete!
Pictures to follow of that process 😉

Picture one. Picture two. Picture three.