Medieval & Renaissance Manuscripts

De sphaera mundi
Italy, Naples, last quarter of 15th century
MS M.426 fol. 7v

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Diagram: Scientific -- Two circular diagrams in left margin. The upper diagram is inscribed LINEA on four lines extending from the center; below the diagram is written CENTRO DELLA SPERA. The lower diagram is bisected by a line, inscribed AXE, with a point at the center of the circle inscribed CENTRO, and each end of the line labeled POLUS; below the diagram is written AXE.