Letter from the Editor.- Letter from the Editor.- Research.- The Holy Alignment: Geodesic and Astronomical Fundamentals for Calculating the Adjustment of Medieval Naves.- Mathematical Interpretation of a Thirteen Hundred Year Old Stone Masonry Observatory.- Akhet Khufu: Archaeo-astronomical Hints at a Common Project of the Two Main Pyramids of Giza, Egypt.- The Megalithic Building of S. Erasmo di Cesi: Architecture, Astronomy, and Landscape.- Geometry, the Measure of the World.- Mathematical Knowledge of Architecture in the Works of Kâshânî.- Didactics.- The Story of Science.- Drawing, Form and Architecture: Two Projects for First-Year Students.- Geometer’s Angle.- The Geometry of the Zodiac.- Book Review.- Robert Tavernor Smoot’s Ear: The Measure of Humanity.- Conference Report.- Nexus VII: Relationships Between Architecture and Mathematics.- Exhibit Report.- Guarini, Juvarra e Antonelli. Segni e simboli per Torino.