the most detailed abstract story about the sun concerning its metaphysical and spiritual dimension i found until now is on the theosophic line, with its three levels of the sun:

physical sun
heart of the sun
central spiritual sun

you can find the most up to date enactment of this framework here: [link to www.shamballaschool.org]

one example: "Venus represents the solar angels and the Fifth Hierarchy coming via the heart of the sun onto the cross of matter that the cosmic physical plane represents."

you can find much food for thought in these books on this topic

and a classic floyd on this topic:)