Sentence:  Of this figure Plato made choice to illustrate the motion of the soul, both the world and man: while he delivereth that God divided the whole conjunction length-wise, according to the figure of a Greek X, and then turning it about reflected it into a circle; by the circle implying  the uniform motion of the first orb, and by the right lines, the <WSD>planetical</WSD> and various motions within it 
Meaning of the word marked with <WSD> tags:  Pertaining to the planets and/or their motions.