My understanding of the sonnet seven

My understanding used to be that the sun wasn't the one author was referring to but now that someone mentioned it I am starting to think that the sun and the human are both in the poem. I think that the author was trying to create a connection between the human and the sun by sharing the differences and similarities between them. I also think that the sun is giving birth to the sun of the next day. The new sun will take place over the old sun and the same with the human. The human has to get a son or risk having his kingdom from being taken over by another family. I used the evidence in the fifth line that said "his sacred Majesty".