Star Science

This historiated initial 'C' marks the beginning of a chapter on the science of ascending degrees in an early printed astronomical or astrological treatise. It depicts a scholar using a scientific instrument to observe the stars, reflecting the text's focus on celestial calculation and the empirical study of the heavens.

This hand-drawn diagram from a 14th-century manuscript illustrates the medieval geocentric model of the universe. It depicts concentric circles representing the celestial spheres, a fundamental concept in pre-Copernican astronomy used to explain the movement of planets and stars.

This woodcut diagram represents a 'Figura celi generalis' or a general figure of the heavens, a standard format for astrological charts in the late 15th century. It divides the celestial sphere into twelve 'houses', each associated with different aspects of life and influence, as discussed in Ptolemy's influential astrological treatise, the Quadripartitum.

This woodcut diagram illustrates principles of spherical geometry, likely related to astronomical calculations. It features a sphere with various intersecting arcs and points labeled for reference in the accompanying Latin text, demonstrating the visual aids used in early modern scientific publishing.

This historiated initial 'P' features a complex allegorical scene within its form. A winged figure and other human forms interact with a dragon-like creature, a common motif in Renaissance book illustration that blends classical and medieval imagery.

This oval seal identifies the volume as part of the 'Bibliotheca Manuscript Sloaneiana,' the vast collection of Sir Hans Sloane (1660–1753). The heraldic shield features a lion and two boars' heads, marking the book's origin in one of the foundational collections of the British Museum.

This circular stamp identifies the volume as part of the 'Bibliotheca Sloaneiana,' the vast collection of Sir Hans Sloane (1660–1753). The heraldic design features a central sword flanked by animal heads, topped by a lion passant, serving as a formal mark of ownership and provenance for one of the founding collections of the British Museum.

A second technical diagram depicting a celestial sphere with complex geometric constructions. Such illustrations were essential for early modern scholars studying planetary motion, navigation, and the mathematical structure of the heavens.

This intricate circular diagram from a 1444 astrological compendium illustrates complex geometric principles used in medieval astronomy. Labeled with terms such as 'Corda recta' (straight chord), it demonstrates the mathematical foundations required for calculating celestial movements and astrological charts during the 15th century.