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A volvelle from a sixteenth-century edition of Sacrobosco's De Sphaera. De sphaera mundi (Latin title meaning On the Sphere of the World, sometimes rendered The Sphere of the Cosmos; the Latin title is also given as Tractatus de sphaera, Textus de sphaera, or simply De sphaera) is a medieval introduction to the basic elements of astronomy written by Johannes de Sacrobosco (John of Holywood) c ...
Taking the distance of the Sun as 1,266 Earth radii, he was forced to place the sphere of Venus above the sphere of the Sun; as a further refinement, he added the planet's diameters to the thickness of their spheres. As a consequence, his version of the nesting spheres model had the sphere of the stars at a distance of 140,177 Earth radii. [34]
The known planets revolved about the Sun, each in its own sphere, in the order: Mercury, Venus, Earth, Mars, Jupiter, Saturn. The Moon, however, revolved in its sphere around the Earth. What appeared to be the daily revolution of the Sun and fixed stars around the Earth was actually the Earth's daily rotation on its own axis.
In addition some of these stars have to travel faster than others: if the Pole Star was precisely at the axis, then it would be entirely stationary whereas those of the equator have unimaginable speed. The solidity of this supposed sphere is incomprehensible. Make the Earth the primum mobile and the need for this extra sphere disappears.
This account was compatible with Aristotle's meteorology [5] of a fiery region in the upper air, dragged along underneath the circular motion of the lunar sphere. [6] For Aristotle, however, the spheres themselves were made entirely of a special fifth element, [ 7 ] Aether (Αἰθήρ) , the bright, untainted upper atmosphere in which the gods ...
The Paradiso assumes the medieval view of the Universe, with the Earth surrounded by concentric spheres containing planets and stars. Dante and Beatrice speak to the teachers of wisdom Thomas Aquinas, Albertus Magnus, Peter Lombard and Sigier of Brabant in the Sphere of the Sun (fresco by Philipp Veit), Canto 10.
article one, section one the dragon rider's codex - "fourth wing," chapter 1. Welcome back to the world of Navarre, where Malek, the god of death, waits around every corner.
This period is also in a very good synchronicity with five Venusian visibility cycles (the Venusian synodic period) and thirteen Venusian revolutions around the Sun (Venusian sidereal period). This means, that if Venus is visible beside the Moon , after eight years the two will be again close together near the same date of the calendar .