Blackstone was born on March 5th. He was buried on May 28th. Blackstone serves as the genius loci or presiding spirit, Henry's Lenten "shriver" (Blackstone was an Anglican minister); this is "Blackstone's Law". Book 3, "July", ends on March 5th. Book 4, "Blackstone's Day-Book", ends on May 28. The basic unit of Book 2, "Grassblade Light", is the poem of 7 stanzas, or 28 lines. The basic unit of "July" is the poem of 28 stanzas. 28 is a "moon-number": silvery, reflective, hermetic. The structure of Forth of July is built on 28 and 29.
Both Anna Akhmatova & Joseph Stalin died on March 5th.