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Wow. I checked out your link, and once I started, I had to read it all the way through. You weren't kidding when you said bizarre!
As far as I can make out, this article's writer adopts a strangely erotic yin/yang dualistic angle about everything. Just as a Buddhist could describe everything in terms of dualisms of action and inaction, light and dark, etc. etc., this writer describes much of it in terms of male and female, in how things act or move, or in another aspect of their nature. The sun he calls male. The sea he calls female.
Like Buddhist dualisms, the writer seems to think everything has its opposite, only he cynically calls these opposites parodies of each other.
I think that "The Solar Anus", itself, as more than a play on words (of the Solar Annulus) but as an image, is the 'Jesuve', the necessary dark parody of the image of the sun, and that is the night. There is one 'hole' in the sphere of sunlight in our orbit, and that is the backside of the Earth. He calls the 'phallic' sun and 'anus' night equally blinding! Perhaps because if you were to see a perfect one (he refers to an 18 year old's), you might gasp and avert your eyes the way you would if had looked into the sun... even though it is dark.