The Sphere of the World (De Sphaera)

Epimus motis hū ... immortalib: Ad hoc dūm aliqui que ... id ... q̄ dūm?

The division of the sphere according to substance.

Id est n ... c ...?
... rē ... p ... Id est ... Id est ... q̄ hinc ... firmamētū vō ... Id est ... vbi ... q̄ hinc ... subat ... vbi sūp ... Id ... sub ... p ...?
Vn ... q̄ n ... cū ... q̄ h ... x ...?

The sphere, however, is divided in two ways: according to substance and according to accident. According to substance: that is, into ten spheres. The tenth sphere, which is called the first motion or the primum mobile first moved, and into the ninth sphere which is named the second mobile. However, the words of the author teach the opposite of these: into nine spheres, namely the ninth sphere which is the first motion or the primum mobile, and into the sphere of the fixed stars which is called the firmament, and into the seven spheres of the seven planets. Of these, some are greater and some are smaller according to whether they approach or recede more or less from the firmament. Whence, among them, the sphere of Saturn is the greatest. The sphere of the moon, however, is the smallest, as is contained in the following figure.

A large, detailed circular diagram of the geocentric (Ptolemaic) universe. The outermost ring depicts the twelve signs of the zodiac (Aries, Taurus, etc.). Moving inwards, concentric circles represent the celestial spheres: the sphere of the fixed stars (marked with asterisks); the spheres of the seven planets, each labeled with its symbol and name—Saturn (♄), Jupiter (♃), Mars (♂), the Sun (☉), Venus (♀), Mercury (☿), and the Moon (☾). The central area depicts the sublunary elements: Ignis (Fire), Aer (Air), Aqua (Water), and Terra (Earth) at the absolute center. Handwritten annotations in Latin are interspersed within the diagram.

[Right of diagram]
id est circulis noster is sum ... sphæra ipsa pro ... videtur ... id est ... sphæra tū ... id est ... mundi ... sphæra ... mundi ...?

The division of the sphere according to accident.

According to accident, however, it is divided into a right sphere and an oblique sphere. Those are said to have a right sphere who remain under the equinoctial, if anyone can remain there. And it is called right because neither of the poles is elevated higher than the other for them. Or because their horizon intersects the equinoctial and is intersected by the same at right spherical angles.

A smaller circular diagram positioned to the right of the lower text block illustrates the "sphæra recta" (right sphere). The circle is bisected vertically by a line labeled "Equinoctialis" (Equator) and horizontally by a line labeled "Horizon". This diagram visualizes a celestial configuration where the celestial equator is at a right angle to the observer's horizon.

[Bottom margin]
... p ... q̄ hoc vbi s ... id est ... r ... id est ... mundi ... vbi ... id est ... r ... id ... vbi ... q̄ d ... r ...?
Extensive handwritten marginalia in a 16th-century hand, appearing to be an interpretive commentary in Early New High German and Latin.