Read "Paphnutius" at The Eldritch Dark:
My blogging journey through the poetic works of Clark Ashton Smith (CAS) largely follows the Hippocampus Press edition of The Complete Poetry and Translations of Clark Ashton Smith, edited by S. T. Joshi and David E. Schultz. In their notes for this particular haiku, they state the the title references Paphnutius of Thebes, an Egyptian bishop of the fourth century.
However, I think the editors might be wrong in this case, since in context it makes more sense that CAS titles this haiku in honor of Paphnutius the Ascetic, an Egyptian anchorite also of the fourth century. I say this because the poem references the Stylites, that curious group of Christian ascetics who preached and prayed from the top of pillars, in pursuit of the same sort of religious goals that inspired Paphnutius' own reclusive lifestyle.
The verse itself is a simple observation of diurnal cycles, rendered with the immediacy that captures the "haiku moment". What's curious to me is that this is one of several haiku that CAS wrote that deal with explicitly Christian themes, an unusual topic for a writer who had little patience with organized religion.