This is the 8th book in Fred Sawyer’s Sciatherics series. It includes translations of Hugo Michnik's early 20th century contributions to the theory of sundials. These include the first full development of the equations for seasonal hour lines on ancient sundials, the introduction of sidereal hour lines for dials, and the invention of the bifilar sundial that indicates time from the intersection of the shadows of two perpendicular wires raised to different heights above the dial face. The book also includes 6 explanatory articles on Michnik and his work, including the first biographical essay to identify who Hugo Michnik was and to give details of his life.