Today’s image comes once again from the many diagrams in BL Royal MS 16 C XII. This particular drawing illustrates how the earth’s shadow is cast by the sun. I appreciate the detail the scribe added to the sun, giving it a face complete with attitude.
The standard geocentric model assumed that the planets were arranged out from the center, the earth, according to the period of revolution. On this assumption, the shorter the period, the closer the planet was to the stationary, central Earth. Claudius Ptolemy ensconced the order in his Syntaxis (commonly know as his Almagest) sometime in the […]