Evershed, M. A. (Orr) · London : Gall & Inglis · leaf 154
. 119 distance and consequently the brightness will constantlyvary, and Mars will be brightest when at perigee P(point nearest Earth), and faintest when in apogeeA (point furthest from Earth).^ But, as the Greeks had discovered, Mars attains hisgreatest brilliance at different points of the zodiac,… … Fig. 23. The Moveable Eccentric. by making PC A turn round upon the fixed point E,so that for instance when the sun had moved througha quarter of his circle (in three months) P A had movedto P A, and the whole eccentric had moved into thenew position shown in the diagram, its centre C beingnow at…
Dante Alighieri, 1265-1321 · Astronomy
Internet Archive · Pontifical Institute of Mediaeval Studies Library · Public Domain Mark 1.0. Free to use for anything.
