As for the halo with the cross inside, it signifies how Jesju is the Lord of this Earth, and it links him to the throne of God at the apex of the Northern hemisphere (nowadays Draco is linked and admired there, but if you gird up the loins of the northers constellations and look out of the box, you see an old man with a huge crown sitting on a throne with an architect studying or handing a pyramid at straight arms, at the Father's right hand you see the Son of Man (which Ursa Major or the big dipper is but a small part of). Even in astronomy today the sign for the Earth is either an upside down Venus/female sign (♀ upside down) or a circle with a cross inside it.

A paralell to this is the king's orb, which is a ball with a cross on top. This regalium signifies God's or Jesju's suvereignity and power over the Earth. The king would typically hold this regalium in his left hand and a scepter in his right and a crown on his head.