What does the poem "Aquarius" by David Malouf mean? What are relevant language, form, structure, ideas, and connections that can be drawn?

In David Malouf's poem "Aquarius," the speaker recalls a special, "sovereign" day, which left him and at least one other ("we," "us") feeling "enchanted." The day seemed like it would never end, and it possibly still seems that way now in their memories. The speaker says that "This is the day that will not end." The future tense of the phrase, "will not," implies that this day is still very much ongoing. In other words, the day still exists in their memories as a kind of "counterworld" that they can retreat to for solace when there is "so much stir," or chaos, in the real world. The speaker describes the "counterworld" where this one "sovereign" day will always continue to exist as an "anti-Eden." In the Bible, the Garden of Eden represents the paradise from which Adam and Eve were expelled for disobeying God. The "counterworld," however, is a paradise from which the speaker has "never been expelled," and hence it is an "anti-Eden."
Besides the biblical allusion noted above, there are other language techniques used throughout the poem. There is, for example, a juxtaposition of imagery connoting light and vitality on the one hand and imagery connoting darkness and stillness on the other. To evoke the light and vitality of the day that lives on as a "counterworld," Malouf describes the "blue upon blue" of the sea, whereas references to the world outside of the "counterworld" draw repeatedly upon "the dark" and "nightfall." Malouf also personifies the sea in the "counterworld," describing the "sea's breath deepen(ing)." Personifying the sea in this way makes the "counterworld" seem alive and fantastical.